Pedro Bay, AK frost dates
Last spring frostJun 2median date
First fall frostSep 12median date
Growing season102 daysfrost-free
Hardiness zone4bZone 4b
How Pedro Bay compares
- In 8 years out of 10, the last spring frost in Pedro Bay falls between May 22 and June 13, a 22-day window. The first fall frost falls between August 29 and September 25.
- The median last frost is 12 days later than the Alaska median of May 21.
- Its 102-day growing season is longer than 24% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 25 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 209 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 22 |
| 50% (median) | June 2 |
| 10% (safe for tender plants) | June 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 29 |
| 50% (median) | September 12 |
| 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 Pedro Bay, AK
Pedro Bay, AK frost dates — last frost Jun 2, first frost Sep 12, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Mar 10 to Mar 24Transplant outside: May 5 to May 19
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Apr 7 to Apr 21Transplant outside: Jun 9 to Jun 23
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26Sow outdoors: May 5 to Jun 9Plant for fall: Jul 18 to Aug 15
Start indoors: Apr 7 to Apr 21Transplant outside: May 5 to May 19Sow outdoors: May 5 to May 19Plant for fall: Jul 4 to Jul 25
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 21 to May 5Transplant outside: Jun 23 to Jul 7Sow outdoors: Jun 23 to Jul 7
Start indoors: Apr 21 to May 5Transplant outside: Jun 9 to Jun 23
Sow outdoors: Apr 21 to May 12Plant for fall: Jun 20 to Jul 11
Sow outdoors: Apr 21 to May 12Plant for fall: Jul 18 to Aug 8
Sow outdoors: Apr 28 to Jun 9Plant for fall: Aug 1 to Aug 22
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 23Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 30
Sow outdoors: May 12 to Jun 9
Sow outdoors: May 12 to Jun 9Plant for fall: Jul 4 to Jul 18
Sow outdoors: May 12 to Jun 2
Sow outdoors: May 19 to Jun 16Plant for fall: Jul 4 to Jul 18
Sow outdoors: May 19 to Jun 9Plant for fall: Jul 18 to Aug 8
Sow outdoors: Jun 9 to Jun 30
Sow outdoors: Jun 9 to Jun 23
Transplant outside: Jun 16 to Jul 7
Plant for fall: Aug 29 to Oct 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pedro Bay, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 10 – Mar 24 | May 5 – May 19 | — | — |
| Peppers | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Eggplant | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Tomatoes | Apr 7 – Apr 21 | Jun 9 – Jun 23 | — | — |
| Lettuce | Apr 7 – Apr 21 | May 12 – May 26 | May 5 – Jun 9 | Jul 18 – Aug 15 |
| Kale | Apr 7 – Apr 21 | May 5 – May 19 | May 5 – May 19 | Jul 4 – Jul 25 |
| Broccoli | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Cabbage | Apr 7 – Apr 21 | May 12 – May 26 | — | — |
| Cauliflower | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Okra | Apr 21 – May 5 | Jun 23 – Jul 7 | Jun 23 – Jul 7 | — |
| Basil | Apr 21 – May 5 | Jun 9 – Jun 23 | — | — |
| Peas | — | — | Apr 21 – May 12 | Jun 20 – Jul 11 |
| Spinach | — | — | Apr 21 – May 12 | Jul 18 – Aug 8 |
| Radishes | — | — | Apr 28 – Jun 9 | Aug 1 – Aug 22 |
| Cucumbers | May 5 – May 12 | Jun 16 – Jun 23 | Jun 9 – Jun 23 | — |
| Zucchini & Summer Squash | May 5 – May 12 | — | Jun 9 – Jun 23 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 102 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 5 – May 12 | — | Jun 9 – Jun 23 | — |
| Melons & Watermelon | May 5 – May 12 | Jun 16 – Jun 30 | — | — |
| Carrots | — | — | May 12 – Jun 9 | — |
| Beets | — | — | May 12 – Jun 9 | Jul 4 – Jul 18 |
| Potatoes | — | — | May 12 – Jun 2 | — |
| Swiss Chard | — | — | May 19 – Jun 16 | Jul 4 – Jul 18 |
| Cilantro | — | — | May 19 – Jun 9 | Jul 18 – Aug 8 |
| Green Beans | — | — | Jun 9 – Jun 30 | — |
| Sweet Corn | — | — | Jun 9 – Jun 23 | — |
| Sweet Potatoes Warning: Your frost-free season is about 102 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 16 – Jul 7 | — | — |
| Garlic | — | — | — | Aug 29 – Oct 3 |
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 Port Alsworth 1 Sw, AK weather station, 39 km away (elevation 322 ft (98 m)).
Frost dates near Pedro Bay
- Port Alsworth May 12 · Sep 24
- Iliamna May 10 · Oct 1
- Nondalton May 10 · Oct 1
- Anchor Point May 16 · Sep 30
- Ninilchik May 16 · Sep 30
- Seldovia May 10 · Oct 1
- Clam Gulch Jun 11 · Sep 1
- Levelock May 26 · Sep 15
- Kasilof Jun 11 · Sep 1
- Homer May 10 · Sep 29
Frequently asked questions
When is the last frost in Pedro Bay, AK?
The median last spring frost in Pedro Bay, AK is June 2. There is still about a 10% chance of frost after June 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pedro Bay, AK?
The median first fall frost is September 12, with about a 10% chance of frost before August 29.
How long is the growing season in Pedro Bay, AK?
About 102 days between the median last spring frost and first fall frost.
What planting zone is Pedro Bay, AK?
Pedro Bay, AK is in USDA hardiness zone 4b.