First and last frost dates in Montana
Compare median spring and fall freeze dates for 60 locations in Montana. Open a city guide for station details and risk levels.
| Location | Last spring freeze | First fall freeze | Days between | Guide |
|---|---|---|---|---|
| Anaconda | June 1 | September 14 | 105 days | |
| Baker | May 12 | September 26 | 137 days | |
| Belgrade | May 26 | September 16 | 113 days | |
| Big Timber | May 14 | September 26 | 135 days | |
| Billings | May 10 | October 1 | 144 days | |
| Boulder | June 7 | September 8 | 93 days | |
| Bozeman | May 26 | September 22 | 119 days | |
| Browning | June 8 | September 5 | 89 days | |
| Butte | June 13 | September 5 | 84 days | |
| Chinook | May 14 | September 23 | 132 days | |
| Choteau | May 28 | September 12 | 107 days | |
| Clancy | June 18 | September 5 | 79 days | |
| Colstrip | May 15 | September 30 | 138 days | |
| Columbia Falls | May 31 | September 10 | 102 days | |
| Columbus | May 27 | September 14 | 110 days | |
| Conrad | May 20 | September 19 | 122 days | |
| Crow Agency | May 13 | September 29 | 139 days | |
| Dillon | June 5 | September 13 | 100 days | |
| East Helena | May 9 | September 30 | 144 days | |
| East Missoula | May 10 | October 1 | 144 days | |
| Eureka | May 11 | September 27 | 139 days | |
| Evergreen | May 31 | September 10 | 102 days | |
| Forsyth | May 9 | September 29 | 143 days | |
| Fort Belknap Agency | May 16 | September 22 | 129 days | |
| Fort Benton | May 15 | September 22 | 130 days | |
| Four Corners | May 23 | September 23 | 123 days | |
| Glasgow | May 3 | October 1 | 151 days | |
| Glendive | May 3 | October 4 | 154 days | |
| Great Falls | May 6 | October 1 | 148 days | |
| Hamilton | May 21 | September 22 | 124 days | |
| Hardin | May 13 | September 29 | 139 days | |
| Havre | May 15 | September 23 | 131 days | |
| Helena Valley Southeast | May 9 | September 30 | 144 days | |
| Kalispell | May 31 | September 10 | 102 days | |
| Lame Deer | May 23 | September 15 | 115 days | |
| Lewistown | May 14 | September 28 | 137 days | |
| Libby | May 23 | September 21 | 121 days | |
| Malmstrom Air Force Base | May 6 | October 1 | 148 days | |
| Malta | May 10 | September 29 | 142 days | |
| Manhattan | May 26 | September 15 | 112 days | |
| Miles City | May 8 | September 30 | 145 days | |
| Missoula | May 10 | October 1 | 144 days | |
| Montana City | May 9 | September 30 | 144 days | |
| North Browning | June 8 | September 5 | 89 days | |
| Polson | May 10 | October 5 | 148 days | |
| Red Lodge | June 3 | September 19 | 108 days | |
| Roundup | May 20 | September 21 | 124 days | |
| Scobey | May 28 | September 6 | 101 days | |
| Shelby | May 23 | September 16 | 116 days | |
| Sidney | May 11 | September 27 | 139 days | |
| Somers | May 12 | September 25 | 136 days | |
| South Browning | June 8 | September 5 | 89 days | |
| Stevensville | May 22 | September 19 | 120 days | |
| Sun Prairie | May 19 | September 24 | 128 days | |
| Thompson Falls | May 7 | October 4 | 150 days | |
| Three Forks | May 9 | September 27 | 141 days | |
| Townsend | May 19 | September 19 | 123 days | |
| Warm Springs | June 1 | September 14 | 105 days | |
| Whitefish | May 16 | September 25 | 132 days | |
| Wolf Point | May 8 | September 28 | 143 days |
Median dates at nearby stations, using a 32°F (0°C) threshold. The interval is calculated from the two median dates, not a guarantee of frost-free weather. Read the methodology.