Kasilof, AK frost dates
Last spring frostJun 11median date
First fall frostSep 1median date
Growing season82 daysfrost-free
Hardiness zone4bZone 4b
How Kasilof compares
- In 8 years out of 10, the last spring frost in Kasilof falls between May 26 and July 7, a 42-day window. The first fall frost falls between August 11 and September 18.
- The median last frost is 21 days later than the Alaska median of May 21.
- Its 82-day growing season is among the shortest of the 165 Alaska places with a regular frost season.
- The last frost is 34 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 227 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 26 |
| 50% (median) | June 11 |
| 10% (safe for tender plants) | July 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 11 |
| 50% (median) | September 1 |
| 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 Kasilof, AK
Kasilof, AK frost dates — last frost Jun 11, first frost Sep 1, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 19 to Apr 2Transplant outside: May 14 to May 28
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 25 to Jul 9
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 25 to Jul 9
Start indoors: Apr 16 to Apr 30Transplant outside: Jun 18 to Jul 2
Start indoors: Apr 16 to Apr 30Transplant outside: May 21 to Jun 4Sow outdoors: May 14 to Jun 18Plant for fall: Jul 7 to Aug 4
Start indoors: Apr 16 to Apr 30Transplant outside: May 14 to May 28Sow outdoors: May 14 to May 28
Start indoors: Apr 16 to Apr 30Transplant outside: May 28 to Jun 11
Start indoors: Apr 16 to Apr 30Transplant outside: May 21 to Jun 4
Start indoors: Apr 16 to Apr 30Transplant outside: May 28 to Jun 11
Start indoors: Apr 30 to May 14Transplant outside: Jul 2 to Jul 16Sow outdoors: Jul 2 to Jul 16
Start indoors: Apr 30 to May 14Transplant outside: Jun 18 to Jul 2
Sow outdoors: Apr 30 to May 21
Sow outdoors: Apr 30 to May 21Plant for fall: Jul 7 to Jul 28
Sow outdoors: May 7 to Jun 18Plant for fall: Jul 21 to Aug 11
Start indoors: May 14 to May 21Transplant outside: Jun 25 to Jul 2Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Transplant outside: Jun 25 to Jul 9
Sow outdoors: May 21 to Jun 18
Sow outdoors: May 21 to Jun 18
Sow outdoors: May 21 to Jun 11
Sow outdoors: May 28 to Jun 25
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 7 to Jul 28
Sow outdoors: Jun 18 to Jul 9
Sow outdoors: Jun 18 to Jul 2
Transplant outside: Jun 25 to Jul 16
Plant for fall: Aug 18 to Sep 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Kasilof, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 19 – Apr 2 | May 14 – May 28 | — | — |
| Peppers Warning: Your frost-free season is about 82 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Apr 2 – Apr 16 | Jun 25 – Jul 9 | — | — |
| Eggplant Warning: Your frost-free season is about 82 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Apr 2 – Apr 16 | Jun 25 – Jul 9 | — | — |
| Tomatoes Warning: Your frost-free season is about 82 days, which is tight for tomatoes (70+ days). Choose early varieties and use transplants or row covers. | Apr 16 – Apr 30 | Jun 18 – Jul 2 | — | — |
| Lettuce | Apr 16 – Apr 30 | May 21 – Jun 4 | May 14 – Jun 18 | Jul 7 – Aug 4 |
| Kale | Apr 16 – Apr 30 | May 14 – May 28 | May 14 – May 28 | — |
| Broccoli | Apr 16 – Apr 30 | May 28 – Jun 11 | — | — |
| Cabbage | Apr 16 – Apr 30 | May 21 – Jun 4 | — | — |
| Cauliflower | Apr 16 – Apr 30 | May 28 – Jun 11 | — | — |
| Okra | Apr 30 – May 14 | Jul 2 – Jul 16 | Jul 2 – Jul 16 | — |
| Basil | Apr 30 – May 14 | Jun 18 – Jul 2 | — | — |
| Peas | — | — | Apr 30 – May 21 | — |
| Spinach | — | — | Apr 30 – May 21 | Jul 7 – Jul 28 |
| Radishes | — | — | May 7 – Jun 18 | Jul 21 – Aug 11 |
| Cucumbers | May 14 – May 21 | Jun 25 – Jul 2 | Jun 18 – Jul 2 | — |
| Zucchini & Summer Squash | May 14 – May 21 | — | Jun 18 – Jul 2 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 82 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 14 – May 21 | — | Jun 18 – Jul 2 | — |
| Melons & Watermelon Warning: Your frost-free season is about 82 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 14 – May 21 | Jun 25 – Jul 9 | — | — |
| Carrots | — | — | May 21 – Jun 18 | — |
| Beets | — | — | May 21 – Jun 18 | — |
| Potatoes | — | — | May 21 – Jun 11 | — |
| Swiss Chard | — | — | May 28 – Jun 25 | — |
| Cilantro | — | — | May 28 – Jun 18 | Jul 7 – Jul 28 |
| Green Beans | — | — | Jun 18 – Jul 9 | — |
| Sweet Corn Warning: Your frost-free season is about 82 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 18 – Jul 2 | — |
| Sweet Potatoes Warning: Your frost-free season is about 82 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 25 – Jul 16 | — | — |
| Garlic | — | — | — | Aug 18 – Sep 22 |
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 Soldotna 5ssw, AK weather station, 14 km away (elevation 180 ft (55 m)).
Frost dates near Kasilof
- Clam Gulch Jun 11 · Sep 1
- Soldotna Jun 11 · Sep 1
- Sterling May 20 · Sep 21
- Kenai May 24 · Sep 12
- Ninilchik May 16 · Sep 30
- Nikiski May 18 · Sep 22
- Anchor Point May 16 · Sep 30
- Cooper Landing Jun 12 · Sep 1
- Tyonek May 18 · Sep 22
- Homer May 10 · Sep 29
Frequently asked questions
When is the last frost in Kasilof, AK?
The median last spring frost in Kasilof, AK is June 11. There is still about a 10% chance of frost after July 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Kasilof, AK?
The median first fall frost is September 1, with about a 10% chance of frost before August 11.
How long is the growing season in Kasilof, AK?
About 82 days between the median last spring frost and first fall frost.
What planting zone is Kasilof, AK?
Kasilof, AK is in USDA hardiness zone 4b.