Frost dates for 99623 — Wasilla, AK
Last spring frostMay 16median date
First fall frostSep 23median date
Growing season130 daysfrost-free
Hardiness zone4bZone 4b
How Wasilla compares
- In 8 years out of 10, the last spring frost in Wasilla falls between May 1 and May 31, a 30-day window. The first fall frost falls between September 8 and October 5.
- The median last frost is 5 days earlier than the Alaska median of May 21.
- Its 130-day growing season is longer than 66% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 8 days later than the zone 4b median of May 8. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4b chart.
- The weather station records an average of 194 nights a year at or below 32°F.
- Compared with Anchorage, AK, 44 km away, the last frost here is 12 days earlier than there and the growing season is 23 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 1 |
| 50% (median) | May 16 |
| 10% (safe for tender plants) | May 31 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 8 |
| 50% (median) | September 23 |
| 90% (late) | October 5 |
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 Wasilla, AK
Frost dates for 99623 — Wasilla, AK — last frost May 16, first frost Sep 23, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 21 to Mar 7Transplant outside: Apr 18 to May 2
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Sow outdoors: Apr 18 to May 23Plant for fall: Jul 29 to Aug 26
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 18 to May 2Sow outdoors: Apr 18 to May 2Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 17 to Jul 8
Start indoors: Apr 4 to Apr 18Transplant outside: Jun 6 to Jun 20Sow outdoors: Jun 6 to Jun 20
Start indoors: Apr 4 to Apr 18Transplant outside: May 23 to Jun 6
Sow outdoors: Apr 4 to Apr 25Plant for fall: Jul 1 to Jul 22
Sow outdoors: Apr 4 to Apr 25Plant for fall: Jul 29 to Aug 19
Sow outdoors: Apr 11 to May 23Plant for fall: Aug 12 to Sep 2
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 6Sow outdoors: May 23 to Jun 6Plant for fall: Jul 8 to Jul 22
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6Plant for fall: Jul 15 to Jul 29
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 1 to Jul 15
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 15 to Jul 29
Sow outdoors: Apr 25 to May 16
Sow outdoors: May 2 to May 30Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 2 to May 23Plant for fall: Jul 29 to Aug 19
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 8 to Jul 22
Sow outdoors: May 23 to Jun 6
Transplant outside: May 30 to Jun 20
Plant for fall: Sep 9 to Oct 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wasilla, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 21 – Mar 7 | Apr 18 – May 2 | — | — |
| Peppers | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Eggplant | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Tomatoes | Mar 21 – Apr 4 | May 23 – Jun 6 | — | — |
| Lettuce | Mar 21 – Apr 4 | Apr 25 – May 9 | Apr 18 – May 23 | Jul 29 – Aug 26 |
| Kale | Mar 21 – Apr 4 | Apr 18 – May 2 | Apr 18 – May 2 | Jul 15 – Aug 5 |
| Broccoli | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 17 – Jul 8 |
| Cabbage | Mar 21 – Apr 4 | Apr 25 – May 9 | — | Jun 17 – Jul 8 |
| Cauliflower | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 17 – Jul 8 |
| Okra | Apr 4 – Apr 18 | Jun 6 – Jun 20 | Jun 6 – Jun 20 | — |
| Basil | Apr 4 – Apr 18 | May 23 – Jun 6 | — | — |
| Peas | — | — | Apr 4 – Apr 25 | Jul 1 – Jul 22 |
| Spinach | — | — | Apr 4 – Apr 25 | Jul 29 – Aug 19 |
| Radishes | — | — | Apr 11 – May 23 | Aug 12 – Sep 2 |
| Cucumbers | Apr 18 – Apr 25 | May 30 – Jun 6 | May 23 – Jun 6 | Jul 8 – Jul 22 |
| Zucchini & Summer Squash | Apr 18 – Apr 25 | — | May 23 – Jun 6 | Jul 15 – Jul 29 |
| Winter Squash & Pumpkins | Apr 18 – Apr 25 | — | May 23 – Jun 6 | — |
| Melons & Watermelon | Apr 18 – Apr 25 | May 30 – Jun 13 | — | — |
| Carrots | — | — | Apr 25 – May 23 | Jul 1 – Jul 15 |
| Beets | — | — | Apr 25 – May 23 | Jul 15 – Jul 29 |
| Potatoes | — | — | Apr 25 – May 16 | — |
| Swiss Chard | — | — | May 2 – May 30 | Jul 15 – Jul 29 |
| Cilantro | — | — | May 2 – May 23 | Jul 29 – Aug 19 |
| Green Beans | — | — | May 23 – Jun 13 | Jul 8 – Jul 22 |
| Sweet Corn | — | — | May 23 – Jun 6 | — |
| Sweet Potatoes | — | May 30 – Jun 20 | — | — |
| Garlic | — | — | — | Sep 9 – Oct 14 |
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 Anderson Lake, AK weather station, 16 km away (elevation 459 ft (140 m)).
ZIP codes in Wasilla: 99623 99629 99654 99687
Frost dates near Wasilla
- Houston May 29 · Sep 7
- Chugiak May 18 · Sep 20
- Big Lake May 29 · Sep 7
- Eagle River May 9 · Sep 26
- Palmer May 22 · Sep 16
- Anchorage May 28 · Sep 12
- Willow May 15 · Sep 18
- Sutton Jun 1 · Sep 6
Frequently asked questions
When is the last frost in Wasilla, AK?
The median last spring frost in Wasilla, AK is May 16. There is still about a 10% chance of frost after May 31, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wasilla, AK?
The median first fall frost is September 23, with about a 10% chance of frost before September 8.
How long is the growing season in Wasilla, AK?
About 130 days between the median last spring frost and first fall frost.
What planting zone is Wasilla, AK?
Wasilla, AK is in USDA hardiness zone 4b.