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I-15 Montana Road Conditions
Radar and live pavement conditions on the 396 miles of I-15 in Montana — plus closures, road work and city-by-city weather across the state.
Updated Sep 10, 2026 6:56 PM MDT · Mostly dry
Lowest 66°F near Helena, Montana · Highest wind 26 mph near Great Falls, Montana
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I-15 runs 396 miles across Montana. It passes Helena and Great Falls.
- Interstate: I-15
- State: Montana
- Length in state: 396 mi
Weather data from Sep 10, 2026 6:56 PM MDT
66°F
82°F
26 mph
29.53-29.72 inHg
Current I-15 in Montana Conditions by State
Montana I-15 in Montana road conditions
Dry
- Helena 82°F · 18 mph wind · Dry
- Great Falls 79°F · 20 mph wind · Dry
I-15 crosses 396 miles of Montana, from the Idaho line to its end in the state. That is 28% of I-15's 1,433 miles.
Inside Montana it meets I-90.
No full closures are reported on I-15 in Montana as of Sep 10, 2026 6:56 PM MDT, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
| Place | Snow a year | Snow days | Freezing nights | Freeze–thaw days | First freeze | Last freeze | Days over 90°F |
|---|---|---|---|---|---|---|---|
| Great Falls | 63.5" | 45.3 | 165.5 | 125.9 | Sep 23 | May 20 | 17.5 |
NOAA 1991–2020 Climate Normals, from a weather station in Montana. A dash is a figure that station does not report, not a zero.
Towns Along I-15 in Montana
From Dillon to Shelby, with the position of each town measured along this stretch itself — counted from the Dillon end, not from a state milepost, so it will not match the numbers on the signs.
- 64 mi Dillon
- 113 mi Butte-Silver Bow (balance)
- 164 mi Boulder
- 189 mi East Helena 2.3 mi off the road
- 192 mi Helena
- 279 mi Great Falls 2.0 mi off the road
- 337 mi Conrad
- 360 mi Shelby 1.0 mi off the road
Places from the US Census Gazetteer and population estimates, both public domain; distances measured along this page's own route geometry.
Summaries fetched Sep 10, 2026 6:04 AM MDT
Great Falls, MT weather
- Current weather conditions in Great Falls, MT indicate a clear sky with a temperature of 59°F and a relative humidity of 39%
- The wind is blowing from the southwest at 12 mph
- The atmospheric pressure is 29.83 inHg, and visibility is good at 10.0 miles
- There are no active weather alerts at this time, and no precipitation is expected.
I-15 in Montana Road Weather FAQ
- Is Interstate 15 in Montana closed right now?
- No full closures are reported on I-15 in Montana. No lane closures or roadworks are reported either.
- What are I-15 in Montana road conditions today?
- The map on this page colors the route along I-15 in Montana by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Sep 10, 2026 6:56 PM MDT. Right now temperatures run from 66°F to 82°F and the strongest wind is 26 mph.
- Where are Montana road closures reported officially?
- Montana's official traveler information service is mdt511.com, and it is where closures and restrictions are reported.
- How often are I-15 in Montana road conditions updated?
- The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.
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