Fort Greely, AK frost dates
Last spring frostMay 26median date
First fall frostSep 2median date
Growing season99 daysfrost-free
Hardiness zone2aZone 2a
How Fort Greely compares
- In 8 years out of 10, the last spring frost in Fort Greely falls between May 14 and June 9, a 26-day window. The first fall frost falls between August 19 and September 18.
- The median last frost is 5 days later than the Alaska median of May 21.
- Its 99-day growing season is longer than 18% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is typical for zone 2a, where the median is May 24.
- The weather station records an average of 232 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 14 |
| 50% (median) | May 26 |
| 10% (safe for tender plants) | June 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 19 |
| 50% (median) | September 2 |
| 90% (late) | September 18 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Fort Greely, AK
Fort Greely, AK frost dates — last frost May 26, first frost Sep 2, zone 2a. whenisthelastfrost.com
Crop
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Start indoors: Mar 3 to Mar 17Transplant outside: Apr 28 to May 12
Start indoors: Mar 17 to Mar 31Transplant outside: Jun 9 to Jun 23
Start indoors: Mar 17 to Mar 31Transplant outside: Jun 9 to Jun 23
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 2 to Jun 16
Start indoors: Mar 31 to Apr 14Transplant outside: May 5 to May 19Sow outdoors: Apr 28 to Jun 2Plant for fall: Jul 8 to Aug 5
Start indoors: Mar 31 to Apr 14Transplant outside: Apr 28 to May 12Sow outdoors: Apr 28 to May 12Plant for fall: Jun 24 to Jul 15
Start indoors: Mar 31 to Apr 14Transplant outside: May 12 to May 26
Start indoors: Mar 31 to Apr 14Transplant outside: May 5 to May 19
Start indoors: Mar 31 to Apr 14Transplant outside: May 12 to May 26
Start indoors: Apr 14 to Apr 28Transplant outside: Jun 16 to Jun 30Sow outdoors: Jun 16 to Jun 30
Start indoors: Apr 14 to Apr 28Transplant outside: Jun 2 to Jun 16
Sow outdoors: Apr 14 to May 5Plant for fall: Jun 10 to Jul 1
Sow outdoors: Apr 14 to May 5Plant for fall: Jul 8 to Jul 29
Sow outdoors: Apr 21 to Jun 2Plant for fall: Jul 22 to Aug 12
Start indoors: Apr 28 to May 5Transplant outside: Jun 9 to Jun 16Sow outdoors: Jun 2 to Jun 16
Start indoors: Apr 28 to May 5Sow outdoors: Jun 2 to Jun 16
Start indoors: Apr 28 to May 5Sow outdoors: Jun 2 to Jun 16
Start indoors: Apr 28 to May 5Transplant outside: Jun 9 to Jun 23
Sow outdoors: May 5 to Jun 2
Sow outdoors: May 5 to Jun 2Plant for fall: Jun 24 to Jul 8
Sow outdoors: May 5 to May 26
Sow outdoors: May 12 to Jun 9Plant for fall: Jun 24 to Jul 8
Sow outdoors: May 12 to Jun 2Plant for fall: Jul 8 to Jul 29
Sow outdoors: Jun 2 to Jun 23
Sow outdoors: Jun 2 to Jun 16
Transplant outside: Jun 9 to Jun 30
Plant for fall: Aug 19 to Sep 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Fort Greely, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 3 – Mar 17 | Apr 28 – May 12 | — | — |
| Peppers | Mar 17 – Mar 31 | Jun 9 – Jun 23 | — | — |
| Eggplant | Mar 17 – Mar 31 | Jun 9 – Jun 23 | — | — |
| Tomatoes | Mar 31 – Apr 14 | Jun 2 – Jun 16 | — | — |
| Lettuce | Mar 31 – Apr 14 | May 5 – May 19 | Apr 28 – Jun 2 | Jul 8 – Aug 5 |
| Kale | Mar 31 – Apr 14 | Apr 28 – May 12 | Apr 28 – May 12 | Jun 24 – Jul 15 |
| Broccoli | Mar 31 – Apr 14 | May 12 – May 26 | — | — |
| Cabbage | Mar 31 – Apr 14 | May 5 – May 19 | — | — |
| Cauliflower | Mar 31 – Apr 14 | May 12 – May 26 | — | — |
| Okra | Apr 14 – Apr 28 | Jun 16 – Jun 30 | Jun 16 – Jun 30 | — |
| Basil | Apr 14 – Apr 28 | Jun 2 – Jun 16 | — | — |
| Peas | — | — | Apr 14 – May 5 | Jun 10 – Jul 1 |
| Spinach | — | — | Apr 14 – May 5 | Jul 8 – Jul 29 |
| Radishes | — | — | Apr 21 – Jun 2 | Jul 22 – Aug 12 |
| Cucumbers | Apr 28 – May 5 | Jun 9 – Jun 16 | Jun 2 – Jun 16 | — |
| Zucchini & Summer Squash | Apr 28 – May 5 | — | Jun 2 – Jun 16 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 99 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 28 – May 5 | — | Jun 2 – Jun 16 | — |
| Melons & Watermelon | Apr 28 – May 5 | Jun 9 – Jun 23 | — | — |
| Carrots | — | — | May 5 – Jun 2 | — |
| Beets | — | — | May 5 – Jun 2 | Jun 24 – Jul 8 |
| Potatoes | — | — | May 5 – May 26 | — |
| Swiss Chard | — | — | May 12 – Jun 9 | Jun 24 – Jul 8 |
| Cilantro | — | — | May 12 – Jun 2 | Jul 8 – Jul 29 |
| Green Beans | — | — | Jun 2 – Jun 23 | — |
| Sweet Corn | — | — | Jun 2 – Jun 16 | — |
| Sweet Potatoes Warning: Your frost-free season is about 99 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 9 – Jun 30 | — | — |
| Garlic | — | — | — | Aug 19 – Sep 23 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Whitestone Farms, AK weather station, 35 km away (elevation 994 ft (303 m)).
Frost dates near Fort Greely
- Delta Junction May 17 · Sep 7
- Salcha May 20 · Sep 1
- Eielson Afb May 20 · Sep 1
- North Pole May 22 · Sep 2
- Two Rivers May 30 · Sep 2
- Fort Wainwright May 16 · Sep 6
- Fairbanks May 16 · Sep 6
- Healy May 27 · Sep 1
- Ester May 24 · Sep 1
- Cantwell frost any month
Frequently asked questions
When is the last frost in Fort Greely, AK?
The median last spring frost in Fort Greely, AK is May 26. There is still about a 10% chance of frost after June 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Fort Greely, AK?
The median first fall frost is September 2, with about a 10% chance of frost before August 19.
How long is the growing season in Fort Greely, AK?
About 99 days between the median last spring frost and first fall frost.
What planting zone is Fort Greely, AK?
Fort Greely, AK is in USDA hardiness zone 2a.