Frost dates for 99683Trapper Creek, AK
The average last spring frost in Trapper Creek is May 16 and the average first fall frost is September 16, giving a typical growing season of about 122 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 16
- Average first fall frost
- Sep 16
- Growing season
- 122 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 1 (1-in-10 risk)
Last frost typically in 201 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 19 · May 29 · Jun 10 | Aug 23 · Sep 3 · Sep 17 | 97 days | 100% |
| Frost / freeze (32°F) | May 6 · May 16 · May 28 | Sep 1 · Sep 16 · Sep 29 | 122 days | 100% |
| Hard freeze (28°F) | Apr 24 · May 5 · May 17 | Sep 13 · Sep 28 · Oct 12 | 146 days | 100% |
Planting calendar for Trapper Creek
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 15 – Jun 21 |
| Tomatoes | Transplant outdoors | Jun 1 – May 27 |
| Peppers | Start seeds indoors | Apr 15 – May 16 |
| Peppers | Transplant outdoors | Jun 15 – Jul 16 |
| Eggplant | Start seeds indoors | May 2 – May 31 |
| Eggplant | Transplant outdoors | Jun 15 – Jul 16 |
| Cucumbers | Sow outdoors | Jun 15 – Jun 6 |
| Summer squash | Sow outdoors | Jun 1 – Jul 16 |
| Winter squash & pumpkins | Sow outdoors | Jun 15 – Jul 16 |
| Snap beans | Sow outdoors | Jun 1 – Jun 29 |
| Sweet corn | Sow outdoors | Jun 1 – May 27 |
| Watermelon & cantaloupe | Sow outdoors | Jun 15 – Jul 16 |
| Okra | Sow outdoors | Jun 8 – Jul 1 |
| Peas | Sow outdoors (spring) | Apr 15 – May 31 |
| Potatoes | Plant outdoors (spring) | Apr 15 – Jun 15 |
| Onions | Start seeds indoors (spring) | Mar 4 – Mar 31 |
| Onions | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (spring) | Mar 28 – May 1 |
| Broccoli | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (fall) | May 17 – May 27 |
| Broccoli | Transplant outdoors (fall) | Jun 16 – Jun 27 |
| Cabbage | Start seeds indoors (spring) | Mar 18 – Apr 15 |
| Cabbage | Transplant outdoors (spring) | Apr 15 – May 16 |
| Cabbage | Start seeds indoors (fall) | May 7 – Jun 6 |
| Cabbage | Transplant outdoors (fall) | Jun 6 – Jul 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 15 – Jul 1 |
| Leaf lettuce | Sow outdoors (fall) | Jun 6 – Jul 23 |
| Spinach | Sow outdoors (spring) | Apr 8 – May 22 |
| Spinach | Sow outdoors (fall) | Jun 23 – Jul 28 |
| Radishes | Sow outdoors (spring) | Apr 15 – Jun 5 |
| Radishes | Sow outdoors (fall) | Jun 6 – Aug 7 |
| Kale | Sow outdoors (spring) | May 2 – May 22 |
| Kale | Sow outdoors (fall) | May 30 – Jul 7 |
| Carrots | Sow outdoors (spring) | May 16 – Jul 1 |
| Carrots | Sow outdoors (fall) | May 7 – Jun 22 |
| Garlic | Plant outdoors (fall) | Sep 6 – Oct 7 |
Where these dates come from
ZIP code 99683 is matched to the NOAA station Talkeetna Ap, AK, 7.1 km away, at 350 ft elevation (8 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Talkeetna Ap, AK (used) | 350 ft | May 16 | Sep 16 |
| Amber Lake, AK | 449 ft | May 28 | Sep 13 |
| Chulitna Rvr, AK | 1,354 ft | — | — |
| Skwentna, AK | 150 ft | May 23 | Sep 9 |
Frost dates near Trapper Creek
- Talkeetna, AK 99676 · last May 16, first Sep 16
- Willow, AK 99688 · last May 29, first Sep 7
- Skwentna, AK 99667 · last May 23, first Sep 9
- Houston, AK 99694 · last May 29, first Sep 7
- Big Lake, AK 99652 · last May 29, first Sep 7
- Wasilla, AK 99629 · last May 16, first Sep 23
- Palmer, AK 99645 · last May 22, first Sep 16
- Chugiak, AK 99567 · last May 21, first Sep 15
Frequently asked questions
- When is the last frost in Trapper Creek, AK?
- For ZIP code 99683, the average last spring frost (32°F) is May 16, based on NOAA 1991-2020 climate normals for the Talkeetna Ap, AK weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Trapper Creek, AK?
- The average first fall frost (32°F) is September 16. There is a 1-in-10 chance of frost by September 1, so tender plants are at risk from that point on.
- How long is the growing season in 99683?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 122 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.