Finding a Forest’s Motor Vehicle Use Map
A Montana ride can look perfectly open on a phone map and still lead to a road that is closed to your machine. A Forest Service Motor Vehicle Use Map, or MVUM, helps you check which routes are designated for motorized use, what vehicle types are allowed, and when seasonal restrictions apply. This guide explains where to find the right map and how to use it before you unload.
What a Montana MVUM Shows
The MVUM is a legal access map, not a trail guide
A Motor Vehicle Use Map is an official Forest Service map showing designated routes and areas where motorized travel is allowed on National Forest System lands. It can identify roads open to highway-legal vehicles, trails open to particular types or sizes of off-highway vehicles, and routes with seasonal dates or other restrictions.
That purpose is narrower than many riders expect. An MVUM is not necessarily a complete picture of every visible track, informal path, or popular riding route. A line on a recreational map—or a track saved by another rider—does not by itself establish that the route is open to your ATV or side-by-side. The MVUM is the document to check for designated motorized access.
It also does not tell you everything you need for a comfortable or safe ride. A route may be legally open but steep, narrow, rough, or unsuitable for a wide machine. For route conditions, difficulty, and planning, pair the MVUM with other appropriate information. [Reading a Montana Motor Vehicle Use Map] is useful when you want help interpreting the map’s symbols and route details.
Check vehicle type, restrictions, and dates
Before following a route, look closely at its designation. A road open to highway-legal vehicles may not be open to every OHV, while a trail may have a width or vehicle-class restriction. Those differences matter if you are riding a full-size side-by-side rather than a dirt bike or narrower ATV.
Dates matter, too. A road or trail can be open only during a designated season, and the opening period can differ from one route to another. A route you rode last summer might not be open yet this spring, even if the snow has melted from the lower stretches. Check the specific dates printed on the relevant map rather than relying on a general assumption about when the forest opens. For more detail, see [Seasonal Dates on a Montana MVUM].
Remember that an MVUM describes motorized designations, not every condition you may encounter on the ground. Snow, fire activity, washouts, maintenance, or temporary closures can affect access. Before making a long drive to a trailhead, check for current alerts as well as the map. [Checking Montana Trail Status Before You Drive] covers that extra planning step.
Where to Find the Right Forest Map
Start with the National Forest or ranger district
First identify which National Forest and ranger district contain the riding area you have in mind. Montana has several large national forests, including the Lolo, Flathead, Custer Gallatin, and Helena-Lewis and Clark. Forest boundaries and district boundaries do not always line up with the nearest town or the route you plan to drive, so start with the specific trailhead, road, or recreation area rather than guessing from a regional map.
Search the official Forest Service website for the forest name and “Motor Vehicle Use Map” or “MVUM.” Look for the map that matches the correct forest and, where the forest provides district maps, the correct district. A broad map for a whole forest may be useful for orientation, but a more detailed district map can be easier to read when you are checking a particular road or trail.
If you are unsure which district covers your destination, contact a Forest Service office and describe the trailhead or route—not just the nearest town. A staff member may be able to point you to the applicable map or explain where to find it. Forest offices and visitor centers can also be useful places to ask about map availability, but check the map details yourself before riding.
Download the map before you lose service
You can often view or download an MVUM through Forest Service pages. Save the correct file to your phone before leaving home or town. Do not wait until you reach a trailhead: service can be unreliable in remote areas, and a map page that loads in Bozeman or Kalispell may not load once you are deep in the forest.
A digital copy makes it easier to zoom in and inspect small route labels, but it helps to have a backup. Download the map for offline use where possible, and consider carrying a printed copy if your route is remote or your phone battery is a concern. For broader backcountry preparation, [Carrying a Paper Map in Grizzly Country] offers a reminder that electronics are useful tools, not guaranteed lifelines.
onX Offroad can help riders explore routes and plan navigation, but treat it as a companion to the official MVUM, not a substitute for it. Compare the route you plan to ride against the Forest Service map, including the route designation and any dates or restrictions. If the two sources appear to disagree, pause and confirm the access status with the land manager rather than assuming the route is open.
| Information source | What it is useful for | What to check |
|---|---|---|
| Official Forest Service MVUM | Designated motorized routes, vehicle types, and seasonal restrictions | Forest, district, map date, route designation, and dates |
| Forest Service alerts or office | Temporary closures and local access questions | Whether an alert applies to your route or trailhead |
| onX Offroad or another navigation app | Route planning, location awareness, and offline navigation features | Whether the proposed route matches the official designation |
| Printed map or saved offline file | Backup access when cell service is unavailable | That the map is legible and covers the full ride |
How to Read the Map Before You Ride
Match your route to the map line
Start by locating your trailhead, staging area, or access road. Then follow the route on the MVUM and check how it is designated. Don’t stop at seeing a line: read the legend and any nearby labels so you understand what that line means for your vehicle. If you are planning a loop, check every segment. One connector road can have a different designation or seasonal limit from the trail you intended to ride.
For example, imagine you plan to ride a side-by-side from a forest road to a trail and then return by a different route. The first road may allow your vehicle, while the connecting trail may be limited to narrower machines. The return route could have seasonal dates. A quick look at a general app map might make the loop appear continuous; checking each segment on the MVUM can reveal where the plan needs to change.
Pay attention to route numbers and signs at junctions. A map and a sign can help you confirm that you have reached the route you intended, but signs do not remove the need to know the route’s designation. If route labels or junctions are confusing, [Montana Trail Signs and Route Numbers] can help you think through how to match what you see on the ground with your planned route.
Treat closures and field conditions as part of the plan
An MVUM is a key reference, but your planning should include more than one check. A fire closure, road work, storm damage, or seasonal condition may change what is practical or permitted after you downloaded the map. Look for forest or district alerts before setting out, and check posted signs and closure notices at the trailhead.
This is especially important early in the riding season. A lower-elevation road may be clear while higher sections remain snow-covered, muddy, or closed to protect the route from damage. If a route is signed closed, do not ride around the barrier just because an app shows a line continuing beyond it. Conditions and restrictions can change, and a detour may take you onto a route that is not designated for your machine.
When uncertain, choose a confirmed open route or ask the responsible Forest Service office for clarification. You can also review [Montana Rules on Forest Service Roads] to understand why a road’s appearance, access history, or presence on a navigation app does not necessarily mean it is open for OHV use.
A Practical Map-Check Routine for Montana Riders
Before you leave home
Use this short routine when planning a ride:
- Pin down the location. Identify the trailhead, road, or riding area and determine which national forest and ranger district manage it.
- Find the official MVUM. Download the map for the correct forest or district from a Forest Service source.
- Check every section of your route. Confirm that your machine is allowed on each road or trail, including connectors and the return route.
- Read the dates and restrictions. Note seasonal openings, closures, vehicle limits, and any other route-specific information.
- Check for newer alerts. Look for temporary closures or conditions that could affect your plan.
- Save a backup. Keep the map available offline, and carry a paper copy when it makes sense for the trip.
Doing this at home is less stressful than trying to interpret a tiny map on a phone while your group waits at a junction. It also gives you time to choose a different route if one part of the planned ride is not open or does not fit your vehicle.
At the trailhead and on the route
Once you arrive, compare the information on your map with posted signs and the route number or name at the access point. If a sign indicates a closure or restriction, follow it. Keep your map available during the ride so you can check upcoming junctions rather than relying on memory or following another group.
If you use onX Offroad for navigation, prepare the relevant area for offline use before heading into a dead zone and keep the Forest Service MVUM accessible separately. onX Offroad can help you see where you are and follow a planned route, while the official map helps you verify the motorized designation. Using both thoughtfully is more dependable than treating either a phone screen or a paper line as the whole answer.
If the route you expected is not clearly designated, do not improvise onto a nearby track. Turn around, choose a route you can verify, or contact the managing office. That small change can prevent a frustrating ride—and help protect trails and access for other riders. To explore other areas and plan future trips, start with [Where to Ride an OHV in Montana] and confirm each destination’s access before you go.
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.
