Frost dates for 99720Allakaket, AK
The average last spring frost in Allakaket is May 22 and the average first fall frost is August 24, giving a typical growing season of about 94 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Aug 24
- Growing season
- 94 days
Safer after Jun 5 (1-in-10 risk)
Possible by Aug 10 (1-in-10 risk)
Last frost typically in 207 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) | — | — | 67 days | 100% |
| Frost / freeze (32°F) | May 11 · May 22 · Jun 5 | Aug 10 · Aug 24 · Sep 9 | 94 days | 100% |
| Hard freeze (28°F) | May 4 · May 13 · May 28 | Aug 22 · Sep 5 · Sep 25 | 115 days | 100% |
Planting calendar for Allakaket
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 | Apr 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – May 4 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – May 14 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jun 6 |
| Sweet corn | Sow outdoors | Jun 7 – May 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | Apr 24 – May 4 |
| Broccoli | Transplant outdoors (fall) | May 24 – Jun 4 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | Apr 14 – May 14 |
| Cabbage | Transplant outdoors (fall) | May 14 – Jun 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | May 14 – Jun 30 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | May 31 – Jul 5 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | May 14 – Jul 15 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | May 7 – Jun 14 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | Apr 14 – May 30 |
| Garlic | Plant outdoors (fall) | Aug 14 – Sep 14 |
Where these dates come from
ZIP code 99720 is matched to the NOAA station Bettles Ap, AK, 63.3 km away, at 642 ft elevation (235 ft higher than the ZIP code's center). This station is relatively far away, so local dates may differ more than usual. Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bettles Ap, AK (used) | 642 ft | May 22 | Aug 24 |
| Wiseman, AK | 1,181 ft | — | — |
| Tanana Calhoun Mem Ap, AK | 227 ft | May 29 | Aug 28 |
| Manley Hot Springs 15Ne, AK | 501 ft | — | — |
Frequently asked questions
- When is the last frost in Allakaket, AK?
- For ZIP code 99720, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Bettles Ap, AK weather station. There is a 1-in-10 chance of a frost after June 5.
- When is the first frost in Allakaket, AK?
- The average first fall frost (32°F) is August 24. There is a 1-in-10 chance of frost by August 10, so tender plants are at risk from that point on.
- How long is the growing season in 99720?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 94 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.