DibbleAlaska frost dates: first and last freeze
Alaska spans USDA Zones 3 to 8, so frost arrives on different dates across the state. Most of Alaska sits in Zone 4, where the last spring frost falls around May 10 and the first fall frost around September 21.
| Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Zone 3 | May 15 | September 15 | 123 |
| Zone 4 (most common) | May 10 | September 21 | 134 |
| Zone 5 | April 30 | October 1 | 154 |
| Zone 6 | April 21 | October 17 | 179 |
| Zone 7 | April 10 | October 29 | 202 |
| Zone 8 | March 28 | November 7 | 224 |
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 ZIP code and warns you the night a frost is actually coming.
What to do with these dates in Alaska
- 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 Alaska planting calendar · Last sowing dates by zone · Frost dates for every state
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