Frost dates for 99929Wrangell, AK
The average last spring frost in Wrangell is April 11 and the average first fall frost is November 1, giving a typical growing season of about 202 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 11
- Average first fall frost
- Nov 1
- Growing season
- 202 days
Safer after Apr 29 (1-in-10 risk)
Possible by Oct 13 (1-in-10 risk)
First frost typically in 5 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 16 · Apr 30 · May 14 | Sep 30 · Oct 16 · Nov 1 | 167 days | 100% |
| Frost / freeze (32°F) | Mar 26 · Apr 11 · Apr 29 | Oct 13 · Nov 1 · Nov 19 | 202 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 24 · Apr 9 | Oct 31 · Nov 18 · Dec 7 | 239 days | 100% |
Planting calendar for Wrangell
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 11 – May 17 |
| Tomatoes | Transplant outdoors | Apr 27 – Jul 12 |
| Peppers | Start seeds indoors | Mar 11 – Apr 11 |
| Peppers | Transplant outdoors | May 11 – Jun 11 |
| Eggplant | Start seeds indoors | Mar 28 – Apr 26 |
| Eggplant | Transplant outdoors | May 11 – Jun 11 |
| Cucumbers | Sow outdoors | May 11 – Jul 22 |
| Summer squash | Sow outdoors | Apr 27 – Jun 11 |
| Winter squash & pumpkins | Sow outdoors | May 11 – Jun 11 |
| Snap beans | Sow outdoors | Apr 27 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 27 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 11 – Jun 11 |
| Okra | Sow outdoors | May 4 – May 27 |
| Peas | Sow outdoors (spring) | Mar 11 – Apr 26 |
| Potatoes | Plant outdoors (spring) | Mar 11 – May 11 |
| Onions | Start seeds indoors (spring) | Jan 28 – Feb 24 |
| Onions | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (spring) | Feb 21 – Mar 27 |
| Broccoli | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 11 – Mar 11 |
| Cabbage | Transplant outdoors (spring) | Mar 11 – Apr 11 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 11 – May 27 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 4 – Apr 17 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 11 – May 1 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 28 – Apr 17 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 11 – May 27 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 99929 is matched to the NOAA station Wrangell Ap, AK, 4.9 km away, at 56 ft elevation (1,076 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wrangell Ap, AK (used) | 56 ft | Apr 11 | Nov 1 |
| Petersburg 1, AK | 107 ft | Apr 29 | Oct 17 |
| Pt Baker, AK | 20 ft | Apr 19 | Oct 25 |
| Thorne Bay, AK | 286 ft | May 1 | Oct 13 |
Frost dates near Wrangell
- Coffman Cove, AK 99918 · last Apr 29, first Oct 16
- Petersburg, AK 99833 · last Apr 29, first Oct 17
- Meyers Chuck, AK 99903 · last May 1, first Oct 13
- Point Baker, AK 99927 · last Apr 19, first Oct 25
- Thorne Bay, AK 99919 · last May 1, first Oct 13
- Klawock, AK 99925 · last Apr 29, first Oct 16
- Craig, AK 99921 · last Apr 14, first Nov 1
Frequently asked questions
- When is the last frost in Wrangell, AK?
- For ZIP code 99929, the average last spring frost (32°F) is April 11, based on NOAA 1991-2020 climate normals for the Wrangell Ap, AK weather station. There is a 1-in-10 chance of a frost after April 29.
- When is the first frost in Wrangell, AK?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 13, so tender plants are at risk from that point on.
- How long is the growing season in 99929?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 202 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.