Frost dates for 99925Klawock, AK
The average last spring frost in Klawock is April 29 and the average first fall frost is October 16, giving a typical growing season of about 169 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 29
- Average first fall frost
- Oct 16
- Growing season
- 169 days
Safer after May 14 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 180 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) | May 4 · May 19 · Jun 3 | Sep 19 · Oct 1 · Oct 17 | 136 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 29 · May 14 | Oct 1 · Oct 16 · Nov 5 | 169 days | 100% |
| Hard freeze (28°F) | Mar 20 · Apr 9 · Apr 28 | Oct 14 · Nov 5 · Nov 28 | 209 days | 100% |
Planting calendar for Klawock
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 29 – Jun 4 |
| Tomatoes | Transplant outdoors | May 15 – Jun 26 |
| Peppers | Start seeds indoors | Mar 29 – Apr 29 |
| Peppers | Transplant outdoors | May 29 – Jun 29 |
| Eggplant | Start seeds indoors | Apr 15 – May 14 |
| Eggplant | Transplant outdoors | May 29 – Jun 29 |
| Cucumbers | Sow outdoors | May 29 – Jul 6 |
| Summer squash | Sow outdoors | May 15 – Jun 29 |
| Winter squash & pumpkins | Sow outdoors | May 29 – Jun 29 |
| Snap beans | Sow outdoors | May 15 – Jul 29 |
| Sweet corn | Sow outdoors | May 15 – Jun 26 |
| Watermelon & cantaloupe | Sow outdoors | May 29 – Jun 29 |
| Okra | Sow outdoors | May 22 – Jun 14 |
| Peas | Sow outdoors (spring) | Mar 29 – May 14 |
| Potatoes | Plant outdoors (spring) | Mar 29 – May 29 |
| Onions | Start seeds indoors (spring) | Feb 15 – Mar 14 |
| Onions | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (spring) | Mar 11 – Apr 14 |
| Broccoli | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (fall) | Jun 16 – Jun 26 |
| Broccoli | Transplant outdoors (fall) | Jul 16 – Jul 27 |
| Cabbage | Start seeds indoors (spring) | Mar 1 – Mar 29 |
| Cabbage | Transplant outdoors (spring) | Mar 29 – Apr 29 |
| Cabbage | Start seeds indoors (fall) | Jun 6 – Jul 6 |
| Cabbage | Transplant outdoors (fall) | Jul 6 – Aug 6 |
| Leaf lettuce | Sow outdoors (spring) | Mar 29 – Jun 14 |
| Leaf lettuce | Sow outdoors (fall) | Jul 6 – Aug 22 |
| Spinach | Sow outdoors (spring) | Mar 22 – May 5 |
| Spinach | Sow outdoors (fall) | Jul 23 – Aug 27 |
| Radishes | Sow outdoors (spring) | Mar 29 – May 19 |
| Radishes | Sow outdoors (fall) | Jul 6 – Sep 6 |
| Kale | Sow outdoors (spring) | Apr 15 – May 5 |
| Kale | Sow outdoors (fall) | Jun 29 – Aug 6 |
| Carrots | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Carrots | Sow outdoors (fall) | Jun 6 – Jul 22 |
| Garlic | Plant outdoors (fall) | Oct 6 – Nov 6 |
Where these dates come from
ZIP code 99925 is matched to the NOAA station Klawock Ap, AK, 3.3 km away, at 12 ft elevation (67 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Klawock Ap, AK (used) | 12 ft | Apr 29 | Oct 16 |
| Craig, AK | 43 ft | Apr 14 | Nov 1 |
| Thorne Bay, AK | 286 ft | May 1 | Oct 13 |
| Ketchikan 10N, AK | 295 ft | Apr 20 | Oct 26 |
Frost dates near Klawock
- Craig, AK 99921 · last Apr 14, first Nov 1
- Thorne Bay, AK 99919 · last May 1, first Oct 13
- Hydaburg, AK 99922 · last Apr 14, first Nov 1
- Coffman Cove, AK 99918 · last Apr 29, first Oct 16
- Meyers Chuck, AK 99903 · last May 1, first Oct 13
- Point Baker, AK 99927 · last Apr 19, first Oct 25
- Wrangell, AK 99929 · last Apr 11, first Nov 1
Frequently asked questions
- When is the last frost in Klawock, AK?
- For ZIP code 99925, the average last spring frost (32°F) is April 29, based on NOAA 1991-2020 climate normals for the Klawock Ap, AK weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Klawock, AK?
- The average first fall frost (32°F) is October 16. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 99925?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 169 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.