White Mountain, AK frost dates
Last spring frostJun 5median date
First fall frostSep 3median date
Growing season90 daysfrost-free
Hardiness zone4aZone 4a
How White Mountain compares
- In 8 years out of 10, the last spring frost in White Mountain falls between May 20 and June 26, a 37-day window. The first fall frost falls between August 15 and September 22.
- The median last frost is 15 days later than the Alaska median of May 21.
- Its 90-day growing season is longer than 4% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 24 days later than the zone 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- The weather station records an average of 231 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 20 |
| 50% (median) | June 5 |
| 10% (safe for tender plants) | June 26 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 15 |
| 50% (median) | September 3 |
| 90% (late) | September 22 |
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 White Mountain, AK
White Mountain, AK frost dates — last frost Jun 5, first frost Sep 3, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Mar 13 to Mar 27Transplant outside: May 8 to May 22
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29Sow outdoors: May 8 to Jun 12Plant for fall: Jul 9 to Aug 6
Start indoors: Apr 10 to Apr 24Transplant outside: May 8 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jun 25 to Jul 16
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 24 to May 8Transplant outside: Jun 26 to Jul 10Sow outdoors: Jun 26 to Jul 10
Start indoors: Apr 24 to May 8Transplant outside: Jun 12 to Jun 26
Sow outdoors: Apr 24 to May 15
Sow outdoors: Apr 24 to May 15Plant for fall: Jul 9 to Jul 30
Sow outdoors: May 1 to Jun 12Plant for fall: Jul 23 to Aug 13
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jul 3
Sow outdoors: May 15 to Jun 12
Sow outdoors: May 15 to Jun 12
Sow outdoors: May 15 to Jun 5
Sow outdoors: May 22 to Jun 19
Sow outdoors: May 22 to Jun 12Plant for fall: Jul 9 to Jul 30
Sow outdoors: Jun 12 to Jul 3
Sow outdoors: Jun 12 to Jun 26
Transplant outside: Jun 19 to Jul 10
Plant for fall: Aug 20 to Sep 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in White Mountain, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 13 – Mar 27 | May 8 – May 22 | — | — |
| Peppers | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Eggplant | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Tomatoes | Apr 10 – Apr 24 | Jun 12 – Jun 26 | — | — |
| Lettuce | Apr 10 – Apr 24 | May 15 – May 29 | May 8 – Jun 12 | Jul 9 – Aug 6 |
| Kale | Apr 10 – Apr 24 | May 8 – May 22 | May 8 – May 22 | Jun 25 – Jul 16 |
| Broccoli | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Cabbage | Apr 10 – Apr 24 | May 15 – May 29 | — | — |
| Cauliflower | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Okra | Apr 24 – May 8 | Jun 26 – Jul 10 | Jun 26 – Jul 10 | — |
| Basil | Apr 24 – May 8 | Jun 12 – Jun 26 | — | — |
| Peas | — | — | Apr 24 – May 15 | — |
| Spinach | — | — | Apr 24 – May 15 | Jul 9 – Jul 30 |
| Radishes | — | — | May 1 – Jun 12 | Jul 23 – Aug 13 |
| Cucumbers | May 8 – May 15 | Jun 19 – Jun 26 | Jun 12 – Jun 26 | — |
| Zucchini & Summer Squash | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 90 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Melons & Watermelon Warning: Your frost-free season is about 90 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 8 – May 15 | Jun 19 – Jul 3 | — | — |
| Carrots | — | — | May 15 – Jun 12 | — |
| Beets | — | — | May 15 – Jun 12 | — |
| Potatoes | — | — | May 15 – Jun 5 | — |
| Swiss Chard | — | — | May 22 – Jun 19 | — |
| Cilantro | — | — | May 22 – Jun 12 | Jul 9 – Jul 30 |
| Green Beans | — | — | Jun 12 – Jul 3 | — |
| Sweet Corn Warning: Your frost-free season is about 90 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 12 – Jun 26 | — |
| Sweet Potatoes Warning: Your frost-free season is about 90 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 19 – Jul 10 | — | — |
| Garlic | — | — | — | Aug 20 – Sep 24 |
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 Nome Muni Ap, AK weather station, 99 km away (elevation 13 ft (4 m)). That is far enough away that your dates may differ, especially if your elevation is different.
Frost dates near White Mountain
- Nome Jun 5 · Sep 3
- Koyuk May 25 · Sep 3
- Shaktoolik May 25 · Sep 3
- Teller Jun 5 · Sep 3
- Unalakleet May 25 · Sep 3
- Deering frost any month
- Brevig Mission Jun 5 · Sep 3
- Buckland frost any month
- Kaltag May 25 · Sep 3
- Kotzebue Jun 5 · Sep 24
Frequently asked questions
When is the last frost in White Mountain, AK?
The median last spring frost in White Mountain, AK is June 5. There is still about a 10% chance of frost after June 26, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in White Mountain, AK?
The median first fall frost is September 3, with about a 10% chance of frost before August 15.
How long is the growing season in White Mountain, AK?
About 90 days between the median last spring frost and first fall frost.
What planting zone is White Mountain, AK?
White Mountain, AK is in USDA hardiness zone 4a.