Montana Speed Limits: 80 mph Interstates, Night Limits and Speeding Fines
What is the speed limit in Montana, and is it lower at night?
On a rural Montana interstate, the speed limit is 80 mph day and night (65 mph in urbanized areas of 50,000 people or more). Other highways are 70 mph by day and 65 mph at night, and an urban district is 25 mph. A speeding fine is $40 on an interstate or $20 on other highways for 1 to 10 mph over, then $70, $120 or $200.
Where the Montana speed limit facts come from
The limits, the passing allowance and the day and night hours come from Montana Code Annotated 61-8-303. The fines and the record rule come from section 61-8-725. Night, school zone and safe speed advice comes from the Montana Driver Manual. Local and school zone limits come from section 61-8-310, work zone rules from section 61-8-314, points from section 61-11-203 and the teen night rule from section 61-5-133. This guide is current as of 2026. Confirm the rules with the Montana Motor Vehicle Division (mvdmt.gov) before you drive.
Montana speed limits by road type
| Road | Day | Night |
|---|---|---|
| Interstate outside an urbanized area of 50,000 people or more | 80 mph | 80 mph |
| Interstate inside an urbanized area of 50,000 people or more | 65 mph | 65 mph |
| Four-lane national highway section of 10 miles or more | 75 mph | 70 mph |
| Any other public highway | 70 mph | 65 mph |
| Urban district | 25 mph | 25 mph |
Is the speed limit lower at night in Montana?
Only on some roads. On a qualifying four-lane national highway and on any other public highway, the limit drops 5 mph at night. On an interstate it stays the same, 80 mph or 65 mph, at all hours.
The law counts "daytime" from half an hour before sunrise to half an hour after sunset. Every other hour is night. The Montana Driver Manual also tells you to slow down at night because you see less, so a legal speed may still be too fast in the dark. New drivers face a separate rule: with some exceptions, the First-Year Restricted License curfew bans driving from 11 p.m. to 5 a.m.
What does the "reasonable and prudent" rule mean?
The listed numbers are the top legal speeds. The law also says to drive no faster than is reasonable and prudent for traffic, visibility, weather and road conditions. When a special hazard exists, a lower speed is the legal one. So 70 mph is not a safe speed in heavy rain or fog just because the limit allows it. Test yourself with a free question on how to drive at a 70 mph limit in heavy rain.
Can you go faster to pass a car?
Yes, but only in one case. On a two-lane road, in a designated passing zone, you may go 10 mph over the limit to pass a vehicle and return safely to the right-hand lane. The allowance does not apply on a multi-lane highway or outside a passing zone. Speeding saves only a few minutes, so pass only when you can do it legally and safely.
How much is a speeding ticket in Montana?
| Miles per hour over the limit | Interstate (80 or 65 mph) | Other highways (75/70 or 70/65 mph) |
|---|---|---|
| 1 to 10 | $40 | $20 |
| 11 to 20 | $70 | $70 |
| 21 to 30 | $120 | $120 |
| 31 or more | $200 | $200 |
How to read the Montana fine table
Find the road type and how far over the limit you were. Only the first row differs: 1 to 10 mph over costs $40 on an interstate and $20 on other highways, by day or at night. From 11 mph over, the fines are the same on all these roads.
Example: you drive 92 mph by day where the limit is 80 mph. That is 12 mph over, so the fine is $70. Because you went over 90 mph on an interstate, the ticket can also go on your driving record.
Does a speeding ticket go on your record or raise your insurance?
School zone and work zone speeds
A local authority can lower the limit in a school zone, or near a senior center or a school crosswalk, to as little as 15 mph. Signs must show where the zone starts, the changed limit, the penalty and where the zone ends. The manual says fines are doubled in all school zones in Montana. Try our free question on the lowest school zone limit.
A work zone has its own limit, set for that project, and signs mark its boundaries. If a highway worker was in the zone at the time and within 1,000 feet of the violation, the fine is at least double.
How to stay on the right side of the limit
- Watch for posted signs. A posted sign can set a different limit from the ones in the table.
- Give yourself more room at speed. Stopping from 60 mph takes more than three times the distance of stopping from 30 mph.
- Slow down at night and in rain, snow or fog, even when the limit is higher.
- Do not crawl on a highway. Going much slower than other traffic can be as risky as speeding.
- Slow down when school zone lights flash, and obey the posted limit in a work zone.
Key takeaways
- The rural interstate limit is 80 mph at all times. Inside an urbanized area of 50,000 people or more, it is 65 mph.
- Other highways are 70 mph by day and 65 mph at night. An urban district is 25 mph.
- Fines start at $40 on an interstate and $20 on other highways for 1 to 10 mph over, then $70, $120 and $200.
- A ticket stays off your record if you were no more than 10 mph over by day or 5 over at night. A bigger ticket can add 3 points.
- Next step: practice on the free Montana Class D practice test.
Montana speed limits: common questions
Can a Montana town set a speed limit higher than 25 mph?
Yes. After an engineering and traffic study, a local authority can raise the limit in an urban district, but not above 65 mph at night. It also sets the limits on arterial streets, which can be higher or lower than 25 mph. A changed limit is in effect when its signs are up, so the posted sign is the limit to follow.
Is a speeding ticket a criminal offense in Montana?
Not for a limit set in section 61-8-303, such as 80 mph on a rural interstate or 70 mph by day on other highways. That violation is not a criminal offense under the listed Montana laws, and you pay the fine from the table. Some speed tickets are misdemeanors: a school zone limit, a limit that a local authority changed after a traffic study, and any traffic violation in a work zone.
How many points is a speeding ticket in Montana?
A speeding conviction counts 3 points, unless the record rule keeps a small ticket off your record. A driver with 30 or more points within 3 years is a habitual traffic offender. If one event leads to two or more convictions, only the conviction with the most points counts. Our guide to Montana teen driver penalties lists the other point values.
Do work zone speed limits apply when no one is working?
Work zone speed signs must be removed or covered when no work is in progress and no hazard exists. When the signs are up, obey the posted limit. If no highway worker was in the zone at the time of the violation, the normal fine applies. With a worker in the zone within 1,000 feet of the violation, the fine is at least double.
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