Frost dates for 99704Clear, AK
The average last spring frost in Clear is May 24 and the average first fall frost is September 4, giving a typical growing season of about 100 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 24
- Average first fall frost
- Sep 4
- Growing season
- 100 days
Safer after Jun 12 (1-in-10 risk)
Possible by Aug 19 (1-in-10 risk)
Last frost typically in 209 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) | — | — | 74 days | 100% |
| Frost / freeze (32°F) | May 11 · May 24 · Jun 12 | Aug 19 · Sep 4 · Sep 18 | 100 days | 100% |
| Hard freeze (28°F) | May 2 · May 11 · May 26 | Sep 1 · Sep 15 · Sep 29 | 124 days | 100% |
Planting calendar for Clear
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 23 – Jun 29 |
| Tomatoes | Transplant outdoors | Jun 9 – May 15 |
| Peppers | Start seeds indoors | Apr 23 – May 24 |
| Peppers | Transplant outdoors | Jun 23 – Jul 24 |
| Eggplant | Start seeds indoors | May 10 – Jun 8 |
| Eggplant | Transplant outdoors | Jun 23 – Jul 24 |
| Cucumbers | Sow outdoors | Jun 23 – May 25 |
| Summer squash | Sow outdoors | Jun 9 – Jul 24 |
| Winter squash & pumpkins | Sow outdoors | Jun 23 – Jul 24 |
| Snap beans | Sow outdoors | Jun 9 – Jun 17 |
| Sweet corn | Sow outdoors | Jun 9 – May 15 |
| Watermelon & cantaloupe | Sow outdoors | Jun 23 – Jul 24 |
| Okra | Sow outdoors | Jun 16 – Jul 9 |
| Peas | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Potatoes | Plant outdoors (spring) | Apr 23 – Jun 23 |
| Onions | Start seeds indoors (spring) | Mar 12 – Apr 8 |
| Onions | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (spring) | Apr 5 – May 9 |
| Broccoli | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (fall) | May 5 – May 15 |
| Broccoli | Transplant outdoors (fall) | Jun 4 – Jun 15 |
| Cabbage | Start seeds indoors (spring) | Mar 26 – Apr 23 |
| Cabbage | Transplant outdoors (spring) | Apr 23 – May 24 |
| Cabbage | Start seeds indoors (fall) | Apr 25 – May 25 |
| Cabbage | Transplant outdoors (fall) | May 25 – Jun 25 |
| Leaf lettuce | Sow outdoors (spring) | Apr 23 – Jul 9 |
| Leaf lettuce | Sow outdoors (fall) | May 25 – Jul 11 |
| Spinach | Sow outdoors (spring) | Apr 16 – May 30 |
| Spinach | Sow outdoors (fall) | Jun 11 – Jul 16 |
| Radishes | Sow outdoors (spring) | Apr 23 – Jun 13 |
| Radishes | Sow outdoors (fall) | May 25 – Jul 26 |
| Kale | Sow outdoors (spring) | May 10 – May 30 |
| Kale | Sow outdoors (fall) | May 18 – Jun 25 |
| Carrots | Sow outdoors (spring) | May 24 – Jul 9 |
| Carrots | Sow outdoors (fall) | Apr 25 – Jun 10 |
| Garlic | Plant outdoors (fall) | Aug 25 – Sep 25 |
Where these dates come from
ZIP code 99704 is matched to the NOAA station Clear Sky, AK, 5.8 km away, at 646 ft elevation (72 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Clear Sky, AK (used) | 646 ft | May 24 | Sep 4 |
| Kobe Hill, AK | 800 ft | May 24 | Sep 2 |
| Nenana Muni Ap, AK | 360 ft | May 15 | Sep 11 |
| Healy, AK | 1,417 ft | May 27 | Sep 1 |
Frost dates near Clear
- Anderson, AK 99744 · last May 15, first Sep 11
- Nenana, AK 99760 · last May 15, first Sep 11
- Healy, AK 99743 · last May 27, first Sep 1
- Ester, AK 99725 · last May 15, first Sep 16
- Fairbanks, AK 99706 · last May 18, first Sep 6
- Minto, AK 99758 · last —, first —
- Denali National Park, AK 99755 · last May 25, first Sep 8
- Cantwell, AK 99729 · last —, first —
Frequently asked questions
- When is the last frost in Clear, AK?
- For ZIP code 99704, the average last spring frost (32°F) is May 24, based on NOAA 1991-2020 climate normals for the Clear Sky, AK weather station. There is a 1-in-10 chance of a frost after June 12.
- When is the first frost in Clear, AK?
- The average first fall frost (32°F) is September 4. There is a 1-in-10 chance of frost by August 19, so tender plants are at risk from that point on.
- How long is the growing season in 99704?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 100 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.