Saint Paul Island, AK frost dates
Last spring frostJun 4median date
First fall frostSep 28median date
Growing season116 daysfrost-free
Hardiness zone6bZone 6b
How Saint Paul Island compares
- In 8 years out of 10, the last spring frost in Saint Paul Island falls between May 16 and June 25, a 40-day window. The first fall frost falls between September 11 and October 15.
- The median last frost is 14 days later than the Alaska median of May 21.
- Its 116-day growing season is longer than 44% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 43 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 176 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 16 |
| 50% (median) | June 4 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 11 |
| 50% (median) | September 28 |
| 90% (late) | October 15 |
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 Saint Paul Island, AK
Saint Paul Island, AK frost dates — last frost Jun 4, first frost Sep 28, zone 6b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 12 to Mar 26Transplant outside: May 7 to May 21
Start indoors: Mar 26 to Apr 9Transplant outside: Jun 18 to Jul 2
Start indoors: Mar 26 to Apr 9Transplant outside: Jun 18 to Jul 2
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 14 to May 28Sow outdoors: May 7 to Jun 11Plant for fall: Aug 3 to Aug 31
Start indoors: Apr 9 to Apr 23Transplant outside: May 7 to May 21Sow outdoors: May 7 to May 21Plant for fall: Jul 20 to Aug 10
Start indoors: Apr 9 to Apr 23Transplant outside: May 21 to Jun 4Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 9 to Apr 23Transplant outside: May 14 to May 28Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 9 to Apr 23Transplant outside: May 21 to Jun 4Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 23 to May 7Transplant outside: Jun 25 to Jul 9Sow outdoors: Jun 25 to Jul 9
Start indoors: Apr 23 to May 7Transplant outside: Jun 11 to Jun 25
Sow outdoors: Apr 23 to May 14Plant for fall: Jul 6 to Jul 27
Sow outdoors: Apr 23 to May 14Plant for fall: Aug 3 to Aug 24
Sow outdoors: Apr 30 to Jun 11Plant for fall: Aug 17 to Sep 7
Start indoors: May 7 to May 14Transplant outside: Jun 18 to Jun 25Sow outdoors: Jun 11 to Jun 25Plant for fall: Jul 13 to Jul 27
Start indoors: May 7 to May 14Sow outdoors: Jun 11 to Jun 25Plant for fall: Jul 20 to Aug 3
Start indoors: May 7 to May 14Sow outdoors: Jun 11 to Jun 25
Start indoors: May 7 to May 14Transplant outside: Jun 18 to Jul 2
Sow outdoors: May 14 to Jun 11Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 14 to Jun 11Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 14 to Jun 4
Sow outdoors: May 21 to Jun 18Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 21 to Jun 11Plant for fall: Aug 3 to Aug 24
Sow outdoors: Jun 11 to Jul 2
Sow outdoors: Jun 11 to Jun 25
Transplant outside: Jun 18 to Jul 9
Plant for fall: Sep 14 to Oct 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Saint Paul Island, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 12 – Mar 26 | May 7 – May 21 | — | — |
| Peppers | Mar 26 – Apr 9 | Jun 18 – Jul 2 | — | — |
| Eggplant | Mar 26 – Apr 9 | Jun 18 – Jul 2 | — | — |
| Tomatoes | Apr 9 – Apr 23 | Jun 11 – Jun 25 | — | — |
| Lettuce | Apr 9 – Apr 23 | May 14 – May 28 | May 7 – Jun 11 | Aug 3 – Aug 31 |
| Kale | Apr 9 – Apr 23 | May 7 – May 21 | May 7 – May 21 | Jul 20 – Aug 10 |
| Broccoli | Apr 9 – Apr 23 | May 21 – Jun 4 | — | Jun 22 – Jul 13 |
| Cabbage | Apr 9 – Apr 23 | May 14 – May 28 | — | Jun 22 – Jul 13 |
| Cauliflower | Apr 9 – Apr 23 | May 21 – Jun 4 | — | Jun 22 – Jul 13 |
| Okra | Apr 23 – May 7 | Jun 25 – Jul 9 | Jun 25 – Jul 9 | — |
| Basil | Apr 23 – May 7 | Jun 11 – Jun 25 | — | — |
| Peas | — | — | Apr 23 – May 14 | Jul 6 – Jul 27 |
| Spinach | — | — | Apr 23 – May 14 | Aug 3 – Aug 24 |
| Radishes | — | — | Apr 30 – Jun 11 | Aug 17 – Sep 7 |
| Cucumbers | May 7 – May 14 | Jun 18 – Jun 25 | Jun 11 – Jun 25 | Jul 13 – Jul 27 |
| Zucchini & Summer Squash | May 7 – May 14 | — | Jun 11 – Jun 25 | Jul 20 – Aug 3 |
| Winter Squash & Pumpkins | May 7 – May 14 | — | Jun 11 – Jun 25 | — |
| Melons & Watermelon | May 7 – May 14 | Jun 18 – Jul 2 | — | — |
| Carrots | — | — | May 14 – Jun 11 | Jul 6 – Jul 20 |
| Beets | — | — | May 14 – Jun 11 | Jul 20 – Aug 3 |
| Potatoes | — | — | May 14 – Jun 4 | — |
| Swiss Chard | — | — | May 21 – Jun 18 | Jul 20 – Aug 3 |
| Cilantro | — | — | May 21 – Jun 11 | Aug 3 – Aug 24 |
| Green Beans | — | — | Jun 11 – Jul 2 | — |
| Sweet Corn | — | — | Jun 11 – Jun 25 | — |
| Sweet Potatoes | — | Jun 18 – Jul 9 | — | — |
| Garlic | — | — | — | Sep 14 – Oct 19 |
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 St Paul Island Ap, AK weather station, 5 km away (elevation 36 ft (11 m)).
Frost dates near Saint Paul Island
- Saint George Island May 31 · Oct 5
- Dutch Harbor May 6 · Oct 18
- Unalaska May 6 · Oct 18
- Akutan May 6 · Oct 18
- Chefornak May 21 · Sep 22
- False Pass May 25 · Oct 4
- Kwigillingok May 21 · Sep 22
- Cold Bay May 25 · Oct 4
- Kongiganak May 21 · Sep 22
- King Cove May 25 · Oct 4
Frequently asked questions
When is the last frost in Saint Paul Island, AK?
The median last spring frost in Saint Paul Island, AK is June 4. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Saint Paul Island, AK?
The median first fall frost is September 28, with about a 10% chance of frost before September 11.
How long is the growing season in Saint Paul Island, AK?
About 116 days between the median last spring frost and first fall frost.
What planting zone is Saint Paul Island, AK?
Saint Paul Island, AK is in USDA hardiness zone 6b.