Frost dates for 99567Chugiak, AK
The average last spring frost in Chugiak is May 21 and the average first fall frost is September 15, giving a typical growing season of about 116 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Sep 15
- Growing season
- 116 days
Safer after Jun 3 (1-in-10 risk)
Possible by Aug 31 (1-in-10 risk)
Last frost typically in 206 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 25 · Jun 4 · Jun 20 | Aug 18 · Sep 2 · Sep 16 | 89 days | 100% |
| Frost / freeze (32°F) | May 8 · May 21 · Jun 3 | Aug 31 · Sep 15 · Sep 27 | 116 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 19 | Sep 10 · Sep 26 · Oct 10 | 143 days | 100% |
Planting calendar for Chugiak
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 20 – Jun 26 |
| Tomatoes | Transplant outdoors | Jun 6 – May 26 |
| Peppers | Start seeds indoors | Apr 20 – May 21 |
| Peppers | Transplant outdoors | Jun 20 – Jul 21 |
| Eggplant | Start seeds indoors | May 7 – Jun 5 |
| Eggplant | Transplant outdoors | Jun 20 – Jul 21 |
| Cucumbers | Sow outdoors | Jun 20 – Jun 5 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jun 28 |
| Sweet corn | Sow outdoors | Jun 6 – May 26 |
| Watermelon & cantaloupe | Sow outdoors | Jun 20 – Jul 21 |
| Okra | Sow outdoors | Jun 13 – Jul 6 |
| Peas | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Potatoes | Plant outdoors (spring) | Apr 20 – Jun 20 |
| Onions | Start seeds indoors (spring) | Mar 9 – Apr 5 |
| Onions | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (spring) | Apr 2 – May 6 |
| Broccoli | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (fall) | May 16 – May 26 |
| Broccoli | Transplant outdoors (fall) | Jun 15 – Jun 26 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 6 – Jun 5 |
| Cabbage | Transplant outdoors (fall) | Jun 5 – Jul 6 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 5 – Jul 22 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jun 22 – Jul 27 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 5 – Aug 6 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | May 29 – Jul 6 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 6 – Jun 21 |
| Garlic | Plant outdoors (fall) | Sep 5 – Oct 6 |
Where these dates come from
ZIP code 99567 is matched to the NOAA station Eagle Rvr 5 Se, AK, 12.6 km away, at 498 ft elevation (140 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Eagle Rvr 5 Se, AK (used) | 498 ft | May 21 | Sep 15 |
| Eklutna Wtp, AK | 640 ft | May 18 | Sep 20 |
| Eagle Rvr Gakona Circle, AK | 567 ft | May 9 | Sep 26 |
| Matanuska Exp Farm, AK | 172 ft | May 14 | Sep 20 |
Frost dates near Chugiak
- Eagle River, AK 99577 · last May 9, first Sep 26
- Wasilla, AK 99687 · last May 14, first Sep 20
- Anchorage, AK 99504 · last May 1, first Sep 29
- Big Lake, AK 99652 · last May 29, first Sep 7
- Houston, AK 99694 · last May 29, first Sep 7
- Indian, AK 99540 · last May 18, first Sep 23
- Palmer, AK 99645 · last May 22, first Sep 16
- Sutton, AK 99674 · last Jun 1, first Sep 6
Frequently asked questions
- When is the last frost in Chugiak, AK?
- For ZIP code 99567, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Eagle Rvr 5 Se, AK weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Chugiak, AK?
- The average first fall frost (32°F) is September 15. There is a 1-in-10 chance of frost by August 31, so tender plants are at risk from that point on.
- How long is the growing season in 99567?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 116 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.