Skwentna, AK frost dates
Last spring frostMay 23median date
First fall frostSep 9median date
Growing season109 daysfrost-free
Hardiness zone4bZone 4b
How Skwentna compares
- In 8 years out of 10, the last spring frost in Skwentna falls between May 8 and June 4, a 27-day window. The first fall frost falls between August 26 and September 25.
- The median last frost is 2 days later than the Alaska median of May 21.
- Its 109-day growing season is longer than 28% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 15 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 222 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 26 |
| 50% (median) | September 9 |
| 90% (late) | September 25 |
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 Skwentna, AK
Skwentna, AK frost dates — last frost May 23, first frost Sep 9, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Jul 15 to Aug 12
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jun 17 to Jul 8
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 15 to Aug 5
Sow outdoors: Apr 18 to May 30Plant for fall: Jul 29 to Aug 19
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 1 to Jul 15
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jun 17 to Jul 1
Sow outdoors: May 2 to May 30Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 9 to May 30Plant for fall: Jul 15 to Aug 5
Sow outdoors: May 30 to Jun 20
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Aug 26 to Sep 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Skwentna, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Jul 15 – Aug 12 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 1 – Jul 22 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | — |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | — |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | — |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jun 17 – Jul 8 |
| Spinach | — | — | Apr 11 – May 2 | Jul 15 – Aug 5 |
| Radishes | — | — | Apr 18 – May 30 | Jul 29 – Aug 19 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | — |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 1 – Jul 15 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 109 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jun 17 – Jul 1 |
| Beets | — | — | May 2 – May 30 | Jul 1 – Jul 15 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 1 – Jul 15 |
| Cilantro | — | — | May 9 – May 30 | Jul 15 – Aug 5 |
| Green Beans | — | — | May 30 – Jun 20 | — |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes Warning: Your frost-free season is about 109 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Aug 26 – Sep 30 |
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 Skwentna, AK weather station, 10 km away (elevation 151 ft (46 m)).
Frost dates near Skwentna
- Trapper Creek May 16 · Sep 16
- Talkeetna May 16 · Sep 16
- Willow May 15 · Sep 18
- Houston May 29 · Sep 7
- Big Lake May 29 · Sep 7
- Tyonek May 18 · Sep 22
- Wasilla May 16 · Sep 23
- Chugiak May 18 · Sep 20
- Anchorage May 28 · Sep 12
- Eagle River May 9 · Sep 26
Frequently asked questions
When is the last frost in Skwentna, AK?
The median last spring frost in Skwentna, AK is May 23. There is still about a 10% chance of frost after June 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Skwentna, AK?
The median first fall frost is September 9, with about a 10% chance of frost before August 26.
How long is the growing season in Skwentna, AK?
About 109 days between the median last spring frost and first fall frost.
What planting zone is Skwentna, AK?
Skwentna, AK is in USDA hardiness zone 4b.