Montana Planting Zones
Montana runs from zone 3b to zone 6b on the 2023 USDA map. Zone 4b is the most common, covering 32% of the state's ZIP codes. Billings is 5a, Missoula is 5b and Bozeman is 5a.
Zones across Montana
| Zone | Average coldest night | Share of Montana ZIP codes |
|---|---|---|
| 3b | −35 to −30°F | 6% |
| 4a | −30 to −25°F | 18% |
| 4b | −25 to −20°F | 32% |
| 5a | −20 to −15°F | 28% |
| 5b | −15 to −10°F | 8% |
| 6a | −10 to −5°F | 8% |
| 6b | −5 to 0°F | under 1% |
Planting zone for every city and town in Montana
Each Montana town uses the ZIP code at its center. Big towns can cross into the next half-zone, so look up your own ZIP if you're near a line.
| City | Zone | Average coldest night |
|---|---|---|
| Alberton | 5b | −15 to −10°F |
| Anaconda-Deer Lodge County | 5a | −20 to −15°F |
| Bainville | 4a | −30 to −25°F |
| Baker | 4b | −25 to −20°F |
| Bearcreek | 5a | −20 to −15°F |
| Belgrade | 5a | −20 to −15°F |
| Belt | 4b | −25 to −20°F |
| Big Sandy | 4a | −30 to −25°F |
| Big Timber | 5a | −20 to −15°F |
| Billings | 5a | −20 to −15°F |
| Boulder | 5a | −20 to −15°F |
| Bozeman | 5a | −20 to −15°F |
| Bridger | 5a | −20 to −15°F |
| Broadus | 4b | −25 to −20°F |
| Broadview | 4b | −25 to −20°F |
| Browning | 4a | −30 to −25°F |
| Butte-Silver Bow | 5a | −20 to −15°F |
| Cascade | 4a | −30 to −25°F |
| Chester | 4a | −30 to −25°F |
| Chinook | 3b | −35 to −30°F |
| Choteau | 4b | −25 to −20°F |
| Circle | 4a | −30 to −25°F |
| Clyde Park | 5a | −20 to −15°F |
| Colstrip | 5a | −20 to −15°F |
| Columbia Falls | 5a | −20 to −15°F |
| Columbus | 5a | −20 to −15°F |
| Conrad | 4a | −30 to −25°F |
| Culbertson | 4a | −30 to −25°F |
| Cut Bank | 4a | −30 to −25°F |
| Darby | 5b | −15 to −10°F |
| Deer Lodge | 4b | −25 to −20°F |
| Denton | 4b | −25 to −20°F |
| Dillon | 5a | −20 to −15°F |
| Dodson | 4a | −30 to −25°F |
| Drummond | 5b | −15 to −10°F |
| Dutton | 4a | −30 to −25°F |
| East Helena | 5a | −20 to −15°F |
| Ekalaka | 4b | −25 to −20°F |
| Ennis | 5a | −20 to −15°F |
| Eureka | 5b | −15 to −10°F |
| Fairfield | 4b | −25 to −20°F |
| Fairview | 4a | −30 to −25°F |
| Flaxville | 4a | −30 to −25°F |
| Forsyth | 4b | −25 to −20°F |
| Fort Benton | 4a | −30 to −25°F |
| Fort Peck | 4a | −30 to −25°F |
| Froid | 4a | −30 to −25°F |
| Fromberg | 5a | −20 to −15°F |
| Geraldine | 4b | −25 to −20°F |
| Glasgow | 4a | −30 to −25°F |
| Glendive | 4a | −30 to −25°F |
| Grass Range | 4b | −25 to −20°F |
| Great Falls | 4b | −25 to −20°F |
| Hamilton | 5b | −15 to −10°F |
| Hardin | 4b | −25 to −20°F |
| Harlem | 4a | −30 to −25°F |
| Harlowton | 4b | −25 to −20°F |
| Havre | 3b | −35 to −30°F |
| Helena | 4b | −25 to −20°F |
| Hingham | 4a | −30 to −25°F |
| Hobson | 4b | −25 to −20°F |
| Hot Springs | 6a | −10 to −5°F |
| Hysham | 4b | −25 to −20°F |
| Ismay | 4a | −30 to −25°F |
| Joliet | 5a | −20 to −15°F |
| Jordan | 4a | −30 to −25°F |
| Judith Gap | 4b | −25 to −20°F |
| Kalispell | 5b | −15 to −10°F |
| Kevin | 4a | −30 to −25°F |
| Laurel | 5a | −20 to −15°F |
| Lavina | 4b | −25 to −20°F |
| Lewistown | 4b | −25 to −20°F |
| Libby | 6a | −10 to −5°F |
| Lima | 5a | −20 to −15°F |
| Livingston | 5a | −20 to −15°F |
| Lodge Grass | 5a | −20 to −15°F |
| Malta | 4a | −30 to −25°F |
| Manhattan | 5a | −20 to −15°F |
| Medicine Lake | 3b | −35 to −30°F |
| Melstone | 4b | −25 to −20°F |
| Miles City | 4b | −25 to −20°F |
| Missoula | 5b | −15 to −10°F |
| Moore | 4b | −25 to −20°F |
| Nashua | 4a | −30 to −25°F |
| Neihart | 4b | −25 to −20°F |
| Opheim | 3b | −35 to −30°F |
| Outlook | 3b | −35 to −30°F |
| Philipsburg | 5a | −20 to −15°F |
| Pinesdale | 5b | −15 to −10°F |
| Plains | 6a | −10 to −5°F |
| Plentywood | 3b | −35 to −30°F |
| Plevna | 4a | −30 to −25°F |
| Polson | 6a | −10 to −5°F |
| Poplar | 4a | −30 to −25°F |
| Red Lodge | 5a | −20 to −15°F |
| Rexford | 5b | −15 to −10°F |
| Richey | 4a | −30 to −25°F |
| Ronan | 6a | −10 to −5°F |
| Roundup | 4b | −25 to −20°F |
| Ryegate | 4b | −25 to −20°F |
| Saco | 3b | −35 to −30°F |
| Scobey | 3b | −35 to −30°F |
| Shelby | 4a | −30 to −25°F |
| Sheridan | 5a | −20 to −15°F |
| Sidney | 4a | −30 to −25°F |
| St. Ignatius | 6a | −10 to −5°F |
| Stanford | 4b | −25 to −20°F |
| Stevensville | 5b | −15 to −10°F |
| Sunburst | 4a | −30 to −25°F |
| Superior | 6a | −10 to −5°F |
| Terry | 4a | −30 to −25°F |
| Thompson Falls | 6a | −10 to −5°F |
| Three Forks | 5a | −20 to −15°F |
| Townsend | 4b | −25 to −20°F |
| Troy | 6a | −10 to −5°F |
| Twin Bridges | 5a | −20 to −15°F |
| Valier | 4b | −25 to −20°F |
| Virginia City | 5a | −20 to −15°F |
| Walkerville | 4a | −30 to −25°F |
| West Yellowstone | 4b | −25 to −20°F |
| Westby | 3b | −35 to −30°F |
| White Sulphur Springs | 4b | −25 to −20°F |
| Whitefish | 5a | −20 to −15°F |
| Whitehall | 5a | −20 to −15°F |
| Wibaux | 4a | −30 to −25°F |
| Winifred | 4b | −25 to −20°F |
| Winnett | 4b | −25 to −20°F |
| Wolf Point | 4a | −30 to −25°F |
Source: USDA Plant Hardiness Zone Map, 2023, Agricultural Research Service, U.S. Department of Agriculture; ZIP code table from the PRISM Group, Oregon State University (accessed Oct 2026). This list is our own summary, not the official USDA map. See how we calculate.
Frequently asked questions
What planting zone is Montana?
Montana spans zones 3b to 6b on the 2023 USDA map, and zone 4b is the most common. Look up your ZIP code for your exact zone.
What zone is Billings, MT?
Billings is zone 5a, where the coldest night of an average winter falls from −20 to −15°F. Plants rated hardy to zone 5 or colder should survive a typical winter there.
More for Montana: Montana climate zones (insulation) · Last frost dates in Montana · Frost line depth by state