Orbit Montana Interstate speed limits
The posted limits on every Interstate in Montana, measured along each road: the limit you'll see most, and the range from the slowest stretch to the fastest. The highest Interstate limit in Montana is 80 mph.
| Interstate | Usually | Range |
|---|---|---|
| I-15 | 80 mph | 65 to 80 mph |
| I-90 | 80 mph | 65 to 80 mph |
| I-94 | 80 mph | 80 mph |
| I-115 | 65 mph | 35 to 65 mph |
| I-315 | 45 mph | 45 to 55 mph |
Posted limits as of October 2026, from state and federal road data and © OpenStreetMap contributors, measured by length of road. Work zones, weather and signs can set a lower limit; always follow the posted sign.
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