South Dakota Trail Width Limits
A machine that fits comfortably on a forest road can still be too wide for a nearby motorized trail. In South Dakota, especially in the Black Hills, trail access depends on the route’s posted or mapped width category—not just whether your ATV or UTV can physically squeeze through. This guide explains how width limits work, how to measure your machine, and how to plan a ride without reaching a trail your vehicle cannot legally use.
How South Dakota trail width limits work
A trail’s category matters more than its appearance
South Dakota riders often encounter trail-width rules in the Black Hills National Forest, where routes can have different designations. Some trails are limited to machines no wider than 62 inches, some are intended for narrower vehicles such as dirt bikes, and some are open to all widths. A wide, smooth-looking trail is not automatically an all-width route, and a narrow entrance is not a reliable substitute for checking the official designation.
The important distinction is that width rules are tied to the route, not simply to the machine. A UTV that measures within a trail’s limit may still be barred by a seasonal closure, a route restriction, or another posted rule. Likewise, a machine wider than 62 inches is not necessarily excluded from every riding opportunity; it needs to stay on routes that allow its width.
This is why a ride can become frustrating if you plan from photographs, campground chatter, or an old track someone shared. A path may look wide enough at the trailhead and then narrow farther along. Before you leave, check the route’s designated width and confirm that the map or notice applies to the section you plan to ride.
Width categories are not interchangeable
A trail marked for machines 62 inches wide or less generally has a maximum vehicle-width threshold. A machine above that limit should not use that route, even if the rider believes there is plenty of room between trees or rocks. The restriction is not a suggestion to proceed carefully; it determines whether the machine is allowed on that trail.
“All widths” is a different designation. It indicates that the route is not limited by the same maximum vehicle-width category, but it does not mean every route connected to it is also open to every machine. A wide vehicle may be able to travel on an all-width segment and then reach a junction with a narrower route. The restriction applies as soon as the machine enters that narrower segment.
Single-track routes are another distinct category. They are intended for motorcycles or similarly narrow machines, not for a quad or side-by-side that happens to fit through a gap. If you are riding with a mixed group, it is especially important to choose a route everyone can legally use rather than assuming that a narrower rider can take a parallel trail and meet up later.
The 62-inch limit is one part of a larger system
Published descriptions of the Black Hills motorized trail network commonly distinguish routes under 62 inches, routes open to all widths, and single-track routes. Those figures can help riders understand that there are different kinds of riding opportunities, but they are not a substitute for a map showing which particular segments are open to their machine.
It is also easy to confuse a width designation with an overall access guarantee. Trail eligibility does not automatically give you permission to ride on every road, trail, or public parcel in the region. A trail permit, seasonal opening, route designation, and local closure can each affect where you may ride. Review [South Dakota Trail Permits Explained] before setting off so permit requirements do not get mixed up with vehicle-width rules.
For a wider machine, the key question is not simply, “Is there a trail system nearby?” It is, “Which connected routes are open to my machine’s measured width on the day I plan to ride?” Keeping that question in mind makes it easier to choose a suitable trailhead and avoid a dead end.
How to measure an ATV or UTV for a trail
Measure the widest point from outside to outside
For trail planning, the relevant measurement is generally the machine’s outside width, measured from the outermost point on one side to the outermost point on the other. For many ATVs and UTVs, that means measuring across the outside edges of the tires. It is not the distance between the wheels, the width of the seat, or the measurement listed in a brochure without checking how the manufacturer defines it.
A simple tape measure can save a lot of uncertainty. Park the vehicle on level ground, point the front wheels straight ahead, and measure across the widest points. If you have unusually wide tires, wheel spacers, aftermarket suspension, or other modifications, include them in the measurement. A machine that was originally within a limit may no longer be once it has been modified.
For a detailed walkthrough, see [Measuring Outside Tire to Outside Tire]. It is worth measuring the actual machine you will take on the trip rather than relying on the model name. Two vehicles from the same product line can have different widths, and accessories or tire choices can change the result.
Check the actual setup, not just the specification sheet
A manufacturer’s published width can be useful as a starting point, but it may describe the vehicle in a particular configuration. Aftermarket tires, wheel offsets, spacers, fender extensions, or other changes can affect the width at the points that matter on a trail. If the measurement is close to the route limit, do not treat a brochure figure as proof that the machine qualifies.
Measure carefully, and if the result is close to 62 inches, consider allowing for measurement error. A tape that is angled, a tire that is not aligned, or measuring from the wrong point can create a misleading result. When there is genuine uncertainty, choose routes that allow a wider machine or ask the relevant land manager for clarification before riding.
Remember that a vehicle’s width can also affect how comfortably it handles narrow trails. A machine may technically meet a width limit but still be challenging to maneuver around trees, rocks, or tight turns. Legal eligibility and practical fit are related, but they are not identical.
Record the measurement before you travel
If you ride in different vehicles or share a machine with family, write down the measured width and keep it with your trip notes. That small step avoids repeating the measurement at a trailhead parking area, where you may not have room to do it carefully. It also helps when comparing your machine with a trail map or asking a ranger about route suitability.
This is particularly useful for groups. Imagine that one couple arrives in a compact ATV while another arrives in a wide six-seat UTV. Both machines may be well suited to forest riding, but they may not have the same trail options. If the group checks widths before leaving home, it can plan a route that works for everyone rather than making an awkward decision at the first junction.
For related details on where narrower and wider vehicles fit into the network, compare [South Dakota Trails Under 62 Inches] with [South Dakota Trails for a Wide Machine]. The names are useful starting points for planning, but check the current route map and notices for the specific trail segments you intend to ride.
Matching your machine to the right route
Machines 62 inches wide or less
If your machine measures 62 inches or less, routes designated for machines under that threshold may be available to you, subject to all other rules. Do not interpret that as permission to ride every trail in the system. Single-track routes, seasonal closures, signed restrictions, and other route-specific controls still apply.
A practical approach is to mark a few suitable routes before your trip and identify the width category for each. That gives you alternatives if a route is closed or if your group decides a particular climb is beyond its comfort level. Around areas such as Hill City, Custer, and the northern Black Hills, checking junctions and access points in advance can keep the day from turning into a search for a route everyone can use.
When comparing trails, consider more than the width number. Terrain, elevation, surface, weather, and rider experience all matter. A machine that fits a route’s width limit may still be poorly matched to a rocky climb or a difficult section after rain.
Machines wider than 62 inches
A UTV wider than 62 inches should be planned around routes designated as open to all widths. Do not assume that a route will become legal simply because it appears wide enough in person. Width designations are managed route by route, and a trail’s physical appearance does not overrule its official restriction.
This can affect the whole shape of a day. A group with a wide side-by-side may need to select a different trailhead, limit how far it travels on a connected network, or choose a route that does not lead into narrower trails. If other riders in the group have smaller machines, plan around the widest vehicle’s legal access rather than expecting it to follow the same route everywhere.
If your vehicle is just over the threshold, do not try to solve the problem by airing down tires, changing the way you measure, or edging around a sign. A modest difference still matters when the trail has a stated maximum. For route ideas and planning considerations, [Where to Ride a Machine Just Over 62 Inches] is a useful companion topic.
Dirt bikes and single-track routes
Single-track trails are meant for narrow, single-rider machines such as dirt bikes. They are not simply narrow alternatives for ATVs or UTVs. Their design, surface, turning space, and intended use differ from routes built for wider vehicles.
If your group includes both motorcycles and quads, talk through the route before anyone rides away. A motorcycle rider may see an attractive single-track connector on the map, while an ATV rider may be restricted to another route. Without a clear meeting plan, riders can become separated or arrive at different trailheads.
For families or mixed-experience groups, it is often easier to choose a shared route category and ride together than to split up in unfamiliar terrain. If you do separate, agree on a specific meeting point, time, and backup plan before losing cell service. Never assume that a mapped connection means every vehicle can legally use it.
| Route designation | General width guidance | Best planning approach |
|---|---|---|
| 62 inches or less | For vehicles within the stated maximum | Measure the machine and confirm the route designation |
| All widths | Not limited by the same maximum-width category | Check connected segments for narrower restrictions |
| Single-track | Intended for narrow, single-track machines | Do not take an ATV or UTV onto it |
| Closed or seasonally restricted | Not open while the restriction applies | Follow current notices and posted signs |
Planning a ride with maps and trail information
Start with an official map or MVUM
A Motor Vehicle Use Map, commonly called an MVUM, is a central planning tool for routes on National Forest land. It identifies roads and trails designated for motorized use and can show information relevant to vehicle access. A general navigation map may be useful for orientation, but it does not necessarily communicate every legal restriction or seasonal designation.
When reviewing a map, look beyond the trail’s number or name. Check the legend, width category, seasonal dates, and any notes attached to the route. Confirm where the route begins and ends, then check each connection you expect to ride. A short connector can change the legal status of the entire loop if it has a different width designation.
For an explanation of map planning, see [South Dakota Trail Maps and MVUMs]. Keep in mind that a map is a planning aid, not permission to ignore a closed gate or a new notice at the trailhead. If information conflicts, stop and confirm with the land manager before continuing.
Use digital maps as a planning aid, not the final authority
Digital mapping can make it easier to compare route options, save a planned loop, and understand where a trail connects to a road or another riding area. onX Offroad can be one tool for organizing route ideas and viewing terrain while planning. As with any mapping app, check what information it displays and whether it reflects the restrictions relevant to your ride.
A useful workflow is to review the official MVUM first, then use a digital map to follow the route and understand how the pieces connect. Save the route before leaving, and download or otherwise prepare for limited service if the app offers that capability. Do not assume that a phone will have a reliable signal in every draw or forested area around the Black Hills.
Before departure, compare your planned route with the latest notices from the land manager and pay attention to signs at the trailhead. onX Offroad may help you visualize a route, but it should not replace the official designation or an on-site closure notice. A route line on a screen is not proof that a particular vehicle is allowed there.
Recheck the route close to your ride date
Trail status can change because of weather, maintenance, fire danger, seasonal opening dates, or other management decisions. A route that was open when you booked a campsite may not be open when you arrive. This is especially important when your plan depends on one narrow connector or a specific loop.
Make a backup plan for the same vehicle category. If your primary route is unavailable, you will be glad to have another legal option rather than improvising at a junction. Check the access point, trailhead parking, and route connections as well as the trail itself; a route that is technically open may not be practical if the approach road is restricted to your machine.
For a pre-trip checklist, use [South Dakota Trail Conditions Before You Ride]. A quick check can prevent a long tow from Rapid City or another base town only to find that your intended trail is closed or unsuitable for your vehicle.
What to do when your machine is close to the limit
Treat a near-limit measurement as a reason to be careful
If your ATV or UTV measures very close to 62 inches, repeat the measurement on level ground and check both the front and rear. Tires may not be perfectly aligned, and a small measurement error can change whether the machine falls within the route category. Do not round down simply because the difference seems minor.
If the machine has been modified, measure it in its ride-ready configuration. A tire change made for better traction on Black Hills rock could alter the overall width. Wheel spacers may also push the tires outward. The dimensions you need are those of the vehicle as it will actually travel, not those of the stock model in a sales listing.
When the result remains uncertain, choose a route that permits wider machines or contact the responsible land manager. That is more reliable than trying to interpret a sign after reaching a junction. A few minutes of checking beforehand can save the group from turning around in a tight area.
Do not rely on squeezing through
Riders sometimes assume that if the machine physically fits between trees, it must be acceptable to ride the trail. That reasoning misses the point of a route-width rule. The stated category is an access restriction, not a promise that every qualifying machine will pass every obstacle without difficulty.
Trying to squeeze a wide UTV through a narrow section can also damage vegetation, scrape the vehicle, or create an unsafe situation for riders coming from the opposite direction. Stopping to reverse out of a tight trail may be difficult on a slope or around a blind corner. If a route is restricted for your vehicle, turn around at a safe place rather than testing the gap.
Signs and gates deserve particular attention. A marker may apply to a trail segment ahead, not only to the spot where it is posted. If you are unsure whether a sign applies to your route, pause in a safe location and verify before continuing. Do not move or bypass a barrier to make a route work for your group.
Know when to change the plan
Sometimes the simplest solution is to choose a different ride. If the group has a wide machine and the planned route is limited to narrower vehicles, look for an all-width option rather than trying to make the original loop fit. A ride that is shorter but legal and comfortable is usually better than a long day spent backtracking.
It can help to plan around the widest vehicle in the group and the least experienced rider. That does not mean every route has to be easy; it means the group should agree on what is suitable before leaving the parking area. A wide machine can still enjoy a satisfying day on a route that matches its access category and the riders’ comfort level.
If the route choice is unclear, ask a ranger district office or the relevant land manager before setting out. Give them the machine’s measured width, the trail or trailhead you have in mind, and the date of your ride. Specific details make it easier to get a useful answer than asking generally whether “UTVs can ride there.”
Trail width is only one part of riding access
Check seasonal dates and closures
A route can fit your machine’s width and still be unavailable because it is seasonally closed. Some Black Hills motorized trails have different opening windows, and weather or other conditions may prompt additional restrictions. Dates and closures can change, so verify the status for the specific trail rather than assuming the entire network opens or closes at once.
Seasonal dates matter when planning trips in spring or late autumn. A trailhead may be accessible while a particular trail remains closed, or one portion of a loop may open later than another. If your route depends on a single connection, confirm that every segment is open for your intended travel date.
Be especially cautious after storms, during periods of fire danger, and when you see a closure notice. A closure may be temporary, but riding through it can create safety, resource, and access problems. Check [South Dakota Trail Closures to Check First] as part of your planning, and obey signs on site even if an older map suggests the route is open.
Understand permits and land boundaries
Width eligibility does not replace permit requirements. Depending on where you ride, you may need the relevant trail permit or other authorization even if your vehicle is the right size for the route. Conversely, having a permit does not allow you to take a machine onto a trail restricted by width or closed to motorized use.
The Black Hills region includes different kinds of land and recreation areas, and their rules are not always the same. Confirm whether your planned route is on National Forest land, within a designated riding area, on a road, or on another type of property. A trail map may help show the route, but you still need to understand which rules apply to that land.
Keep permits, decals, and any required documentation in order before riding. If you are visiting from another state, check the rules that apply to your plate and permit situation rather than assuming your home-state registration covers every South Dakota trail. Keep width, permit, and land-access questions separate as you plan; each can affect whether the ride is allowed.
Follow the route on the ground
Once you are out riding, watch for signs at trailheads, junctions, and route transitions. A marked route may change category, end, or connect to another route with different restrictions. If you are navigating by phone, stop in a safe place to check the map rather than looking down while moving.
It helps to identify junctions before leaving. Note the trail number, the direction of travel, and the point where you plan to turn around or connect to another route. This is especially useful in a group where riders may have different machines or where dust makes it hard to keep everyone together.
If you reach a sign that conflicts with your plan, follow the sign and reassess. Do not assume that a friend’s old track, an app route, or another rider’s recollection overrides what is posted. The most dependable plan combines a measured machine, a suitable official route designation, current closure information, and attention to signs on the ground.
A practical pre-ride checklist
Before loading up, measure the machine from outside tire to outside tire in its current setup. Record the result, and if it is close to a trail’s stated limit, avoid relying on a rough estimate. Confirm that every vehicle in your group fits the route category you intend to ride.
Next, choose a route using an official map or MVUM. Check the designation for each segment, not just the trailhead or the first section of the ride. Use digital mapping, including onX Offroad if it helps you follow your plan, as a navigation aid alongside official information—not as a replacement for it.
Then verify permits, seasonal access, and current closures. Identify a backup route that works for the same machines, and make sure everyone knows where the group will regroup if you become separated. When you arrive, read the trailhead signs and adjust the plan if posted information differs from what you reviewed at home.
A short checklist can make the routine easier:
- Measure the widest point of each machine.
- Match every vehicle to the route’s width category.
- Review the official map and the route’s connections.
- Check seasonal dates and current closures.
- Confirm permit and land-access requirements.
- Save a backup route and agree on meeting points.
- Follow posted signs and barriers during the ride.
Width limits are much easier to manage before the trailer is unloaded. Once you know the actual size of your ATV or UTV and choose routes that match it, you can spend less time second-guessing junctions and more time enjoying the ride.
Disclaimer
This article is for general informational purposes only and does not constitute professional advice. Laws, prices and regulations vary by location and change over time. Consult a qualified professional for guidance on your specific situation.
