Moose Pass, AK frost dates
Last spring frostMay 31median date
First fall frostSep 8median date
Growing season100 daysfrost-free
Hardiness zone5aZone 5a
How Moose Pass compares
- In 8 years out of 10, the last spring frost in Moose Pass falls between May 19 and June 15, a 27-day window. The first fall frost falls between August 24 and September 25.
- The median last frost is 10 days later than the Alaska median of May 21.
- Its 100-day growing season is longer than 18% of the 165 Alaska places with a regular frost season (state median 124 days).
- The last frost is 28 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 197 nights a year at or below 32°F.
- Compared with Anchorage, AK, 67 km away, the last frost here is 3 days later than there and the growing season is 7 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 19 |
| 50% (median) | May 31 |
| 10% (safe for tender plants) | June 15 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 24 |
| 50% (median) | September 8 |
| 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 Moose Pass, AK
Moose Pass, AK frost dates — last frost May 31, first frost Sep 8, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Mar 8 to Mar 22Transplant outside: May 3 to May 17
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 7 to Jun 21
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24Sow outdoors: May 3 to Jun 7Plant for fall: Jul 14 to Aug 11
Start indoors: Apr 5 to Apr 19Transplant outside: May 3 to May 17Sow outdoors: May 3 to May 17Plant for fall: Jun 30 to Jul 21
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31
Start indoors: Apr 19 to May 3Transplant outside: Jun 21 to Jul 5Sow outdoors: Jun 21 to Jul 5
Start indoors: Apr 19 to May 3Transplant outside: Jun 7 to Jun 21
Sow outdoors: Apr 19 to May 10Plant for fall: Jun 16 to Jul 7
Sow outdoors: Apr 19 to May 10Plant for fall: Jul 14 to Aug 4
Sow outdoors: Apr 26 to Jun 7Plant for fall: Jul 28 to Aug 18
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 21Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 28
Sow outdoors: May 10 to Jun 7
Sow outdoors: May 10 to Jun 7Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 10 to May 31
Sow outdoors: May 17 to Jun 14Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 17 to Jun 7Plant for fall: Jul 14 to Aug 4
Sow outdoors: Jun 7 to Jun 28
Sow outdoors: Jun 7 to Jun 21
Transplant outside: Jun 14 to Jul 5
Plant for fall: Aug 25 to Sep 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Moose Pass, AK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 8 – Mar 22 | May 3 – May 17 | — | — |
| Peppers | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Eggplant | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Tomatoes | Apr 5 – Apr 19 | Jun 7 – Jun 21 | — | — |
| Lettuce | Apr 5 – Apr 19 | May 10 – May 24 | May 3 – Jun 7 | Jul 14 – Aug 11 |
| Kale | Apr 5 – Apr 19 | May 3 – May 17 | May 3 – May 17 | Jun 30 – Jul 21 |
| Broccoli | Apr 5 – Apr 19 | May 17 – May 31 | — | — |
| Cabbage | Apr 5 – Apr 19 | May 10 – May 24 | — | — |
| Cauliflower | Apr 5 – Apr 19 | May 17 – May 31 | — | — |
| Okra | Apr 19 – May 3 | Jun 21 – Jul 5 | Jun 21 – Jul 5 | — |
| Basil | Apr 19 – May 3 | Jun 7 – Jun 21 | — | — |
| Peas | — | — | Apr 19 – May 10 | Jun 16 – Jul 7 |
| Spinach | — | — | Apr 19 – May 10 | Jul 14 – Aug 4 |
| Radishes | — | — | Apr 26 – Jun 7 | Jul 28 – Aug 18 |
| Cucumbers | May 3 – May 10 | Jun 14 – Jun 21 | Jun 7 – Jun 21 | — |
| Zucchini & Summer Squash | May 3 – May 10 | — | Jun 7 – Jun 21 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 100 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 3 – May 10 | — | Jun 7 – Jun 21 | — |
| Melons & Watermelon | May 3 – May 10 | Jun 14 – Jun 28 | — | — |
| Carrots | — | — | May 10 – Jun 7 | — |
| Beets | — | — | May 10 – Jun 7 | Jun 30 – Jul 14 |
| Potatoes | — | — | May 10 – May 31 | — |
| Swiss Chard | — | — | May 17 – Jun 14 | Jun 30 – Jul 14 |
| Cilantro | — | — | May 17 – Jun 7 | Jul 14 – Aug 4 |
| Green Beans | — | — | Jun 7 – Jun 28 | — |
| Sweet Corn | — | — | Jun 7 – Jun 21 | — |
| Sweet Potatoes Warning: Your frost-free season is about 100 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 14 – Jul 5 | — | — |
| Garlic | — | — | — | Aug 25 – Sep 29 |
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 Moose Pass 3nw, AK weather station, 13 km away (elevation 492 ft (150 m)).
Frost dates near Moose Pass
- Cooper Landing Jun 12 · Sep 1
- Hope May 18 · Sep 24
- Girdwood May 8 · Sep 29
- Whittier Apr 25 · Oct 14
- Seward May 2 · Oct 7
- Indian May 18 · Sep 23
- Anchorage May 28 · Sep 12
- Eagle River May 9 · Sep 26
- Sterling May 20 · Sep 21
- Chugiak May 18 · Sep 20
Frequently asked questions
When is the last frost in Moose Pass, AK?
The median last spring frost in Moose Pass, AK is May 31. There is still about a 10% chance of frost after June 15, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Moose Pass, AK?
The median first fall frost is September 8, with about a 10% chance of frost before August 24.
How long is the growing season in Moose Pass, AK?
About 100 days between the median last spring frost and first fall frost.
What planting zone is Moose Pass, AK?
Moose Pass, AK is in USDA hardiness zone 5a.