DibbleMontana frost dates: first and last freeze
Montana spans USDA Zones 3 to 6, so frost arrives on different dates across the state. Most of Montana sits in Zone 4, where the last spring frost falls around May 10 and the first fall frost around October 5.
| Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Zone 3 | May 18 | September 25 | 130 |
| Zone 4 (most common) | May 10 | October 5 | 148 |
| Zone 5 | May 3 | October 12 | 162 |
| Zone 6 | April 25 | October 21 | 179 |
These are typical dates for the zone, not a forecast. A frost can land a couple of weeks either side, and your own yard has its own microclimate. Dibble pins the dates to your garden's own location and sends a frost warning the evening before a cold night: one a season free, and live alerts all season with Premium.
What to do with these dates in Montana
- Count back from the last spring frost to know when to start seeds indoors.
- Wait until after it to move out tomatoes, peppers, and anything else frost-tender.
- Count back from the first fall frost to find the last useful sowing date.
- Cover or harvest before the first fall frost lands.
Keep exploring
The Montana planting calendar · Last sowing dates by zone · Frost dates for every state
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