Frost dates for 99566Chitina, AK
The average last spring frost in Chitina is May 31 and the average first fall frost is September 3, giving a typical growing season of about 95 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Sep 3
- Growing season
- 95 days
Safer after Jun 10 (1-in-10 risk)
Possible by Aug 20 (1-in-10 risk)
Last frost typically in 216 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) | — | — | 64 days | 100% |
| Frost / freeze (32°F) | May 20 · May 31 · Jun 10 | Aug 20 · Sep 3 · Sep 17 | 95 days | 100% |
| Hard freeze (28°F) | May 8 · May 16 · May 27 | Sep 4 · Sep 17 · Sep 29 | 121 days | 100% |
Planting calendar for Chitina
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 30 – Jul 6 |
| Tomatoes | Transplant outdoors | Jun 16 – May 14 |
| Peppers | Start seeds indoors | Apr 30 – May 31 |
| Peppers | Transplant outdoors | Jun 30 – Jul 31 |
| Eggplant | Start seeds indoors | May 17 – Jun 15 |
| Eggplant | Transplant outdoors | Jun 30 – Jul 31 |
| Cucumbers | Sow outdoors | Jun 30 – May 24 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jun 16 |
| Sweet corn | Sow outdoors | Jun 16 – May 14 |
| Watermelon & cantaloupe | Sow outdoors | Jun 30 – Jul 31 |
| Okra | Sow outdoors | Jun 23 – Jul 16 |
| Peas | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Potatoes | Plant outdoors (spring) | Apr 30 – Jun 30 |
| Onions | Start seeds indoors (spring) | Mar 19 – Apr 15 |
| Onions | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (spring) | Apr 12 – May 16 |
| Broccoli | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (fall) | May 4 – May 14 |
| Broccoli | Transplant outdoors (fall) | Jun 3 – Jun 14 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | Apr 24 – May 24 |
| Cabbage | Transplant outdoors (fall) | May 24 – Jun 24 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | May 24 – Jul 10 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 10 – Jul 15 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | May 24 – Jul 25 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | May 17 – Jun 24 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | Apr 24 – Jun 9 |
| Garlic | Plant outdoors (fall) | Aug 24 – Sep 24 |
Where these dates come from
ZIP code 99566 is matched to the NOAA station Silver Lake, AK, 13.2 km away, at 1,200 ft elevation (616 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Silver Lake, AK (used) | 1,200 ft | May 31 | Sep 3 |
| Tonsina, AK | 1,579 ft | — | — |
| Mccarthy 3 Sw, AK | 1,250 ft | — | — |
| Gennallen Kcam, AK | 1,383 ft | — | — |
Frost dates near Chitina
- Copper Center, AK 99573 · last —, first —
- Glennallen, AK 99588 · last Jun 7, first Aug 21
- Gakona, AK 99586 · last Jun 7, first Aug 21
Frequently asked questions
- When is the last frost in Chitina, AK?
- For ZIP code 99566, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Silver Lake, AK weather station. There is a 1-in-10 chance of a frost after June 10.
- When is the first frost in Chitina, AK?
- The average first fall frost (32°F) is September 3. There is a 1-in-10 chance of frost by August 20, so tender plants are at risk from that point on.
- How long is the growing season in 99566?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 95 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.