Frost dates for 99716Two Rivers, AK
The average last spring frost in Two Rivers is May 30 and the average first fall frost is September 2, giving a typical growing season of about 95 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 30
- Average first fall frost
- Sep 2
- Growing season
- 95 days
Safer after Jun 13 (1-in-10 risk)
Possible by Aug 13 (1-in-10 risk)
Last frost typically in 215 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) | — | — | 68 days | 100% |
| Frost / freeze (32°F) | May 12 · May 30 · Jun 13 | Aug 13 · Sep 2 · Sep 17 | 95 days | 100% |
| Hard freeze (28°F) | Apr 30 · May 16 · May 31 | Aug 31 · Sep 16 · Sep 30 | 123 days | 100% |
Planting calendar for Two Rivers
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 29 – Jul 5 |
| Tomatoes | Transplant outdoors | Jun 15 – May 13 |
| Peppers | Start seeds indoors | Apr 29 – May 30 |
| Peppers | Transplant outdoors | Jun 29 – Jul 30 |
| Eggplant | Start seeds indoors | May 16 – Jun 14 |
| Eggplant | Transplant outdoors | Jun 29 – Jul 30 |
| Cucumbers | Sow outdoors | Jun 29 – May 23 |
| Summer squash | Sow outdoors | Jun 15 – Jul 30 |
| Winter squash & pumpkins | Sow outdoors | Jun 29 – Jul 30 |
| Snap beans | Sow outdoors | Jun 15 – Jun 15 |
| Sweet corn | Sow outdoors | Jun 15 – May 13 |
| Watermelon & cantaloupe | Sow outdoors | Jun 29 – Jul 30 |
| Okra | Sow outdoors | Jun 22 – Jul 15 |
| Peas | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Potatoes | Plant outdoors (spring) | Apr 29 – Jun 29 |
| Onions | Start seeds indoors (spring) | Mar 18 – Apr 14 |
| Onions | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (spring) | Apr 11 – May 15 |
| Broccoli | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (fall) | May 3 – May 13 |
| Broccoli | Transplant outdoors (fall) | Jun 2 – Jun 13 |
| Cabbage | Start seeds indoors (spring) | Apr 1 – Apr 29 |
| Cabbage | Transplant outdoors (spring) | Apr 29 – May 30 |
| Cabbage | Start seeds indoors (fall) | Apr 23 – May 23 |
| Cabbage | Transplant outdoors (fall) | May 23 – Jun 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 29 – Jul 15 |
| Leaf lettuce | Sow outdoors (fall) | May 23 – Jul 9 |
| Spinach | Sow outdoors (spring) | Apr 22 – Jun 5 |
| Spinach | Sow outdoors (fall) | Jun 9 – Jul 14 |
| Radishes | Sow outdoors (spring) | Apr 29 – Jun 19 |
| Radishes | Sow outdoors (fall) | May 23 – Jul 24 |
| Kale | Sow outdoors (spring) | May 16 – Jun 5 |
| Kale | Sow outdoors (fall) | May 16 – Jun 23 |
| Carrots | Sow outdoors (spring) | May 30 – Jul 15 |
| Carrots | Sow outdoors (fall) | Apr 23 – Jun 8 |
| Garlic | Plant outdoors (fall) | Aug 23 – Sep 23 |
Where these dates come from
ZIP code 99716 is matched to the NOAA station Two Rivers, AK, 2.8 km away, at 605 ft elevation (14 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Two Rivers, AK (used) | 605 ft | May 30 | Sep 2 |
| N Pole, AK | 475 ft | May 18 | Sep 5 |
| N Pole 1N, AK | 496 ft | May 22 | Sep 2 |
| Eielson Fld, AK | 547 ft | May 20 | Sep 1 |
Frost dates near Two Rivers
- Eielson Afb, AK 99702 · last May 20, first Sep 1
- North Pole, AK 99705 · last May 18, first Sep 5
- Fairbanks, AK 99712 · last Jun 1, first Aug 28
- Fort Wainwright, AK 99703 · last May 16, first Sep 6
- Salcha, AK 99714 · last May 20, first Sep 1
- Ester, AK 99725 · last May 15, first Sep 16
- Fort Greely, AK 99731 · last May 17, first Sep 7
- Delta Junction, AK 99737 · last May 17, first Sep 7
Frequently asked questions
- When is the last frost in Two Rivers, AK?
- For ZIP code 99716, the average last spring frost (32°F) is May 30, based on NOAA 1991-2020 climate normals for the Two Rivers, AK weather station. There is a 1-in-10 chance of a frost after June 13.
- When is the first frost in Two Rivers, AK?
- The average first fall frost (32°F) is September 2. There is a 1-in-10 chance of frost by August 13, so tender plants are at risk from that point on.
- How long is the growing season in 99716?
- 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.