Frost dates for 99841Tenakee Springs, AK
The average last spring frost in Tenakee Springs is May 9 and the average first fall frost is October 4, giving a typical growing season of about 145 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 4
- Growing season
- 145 days
Safer after Jul 4 (1-in-10 risk)
Possible by Sep 1 (1-in-10 risk)
Last frost typically in 194 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) | — | — | 120 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 9 · Jul 4 | Sep 1 · Oct 4 · Oct 26 | 145 days | 100% |
| Hard freeze (28°F) | Apr 3 · Apr 26 · Jul 3 | Sep 2 · Oct 19 · Nov 15 | 174 days | 100% |
Planting calendar for Tenakee Springs
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 14 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 24 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 17 |
| Sweet corn | Sow outdoors | May 25 – Jun 14 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 4 – Jun 14 |
| Broccoli | Transplant outdoors (fall) | Jul 4 – Jul 15 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 25 – Jun 24 |
| Cabbage | Transplant outdoors (fall) | Jun 24 – Jul 25 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 24 – Aug 10 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 11 – Aug 15 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 24 – Aug 25 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 17 – Jul 25 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 25 – Jul 10 |
| Garlic | Plant outdoors (fall) | Sep 24 – Oct 25 |
Where these dates come from
ZIP code 99841 is matched to the NOAA station Hoonah, AK, 38.3 km away, at 130 ft elevation (22 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hoonah, AK (used) | 130 ft | May 9 | Oct 4 |
| Pelican, AK | 12 ft | May 4 | Oct 19 |
| Hidden Falls Hatchery, AK | 22 ft | Apr 29 | Oct 25 |
| Eaglecrest Base, AK | 1,134 ft | May 21 | Oct 1 |
Frost dates near Tenakee Springs
- Hoonah, AK 99829 · last May 9, first Oct 4
- Angoon, AK 99820 · last Apr 29, first Oct 25
- Pelican, AK 99832 · last May 4, first Oct 19
- Douglas, AK 99824 · last Apr 20, first Oct 22
- Juneau, AK 99802 · last Apr 20, first Oct 22
- Gustavus, AK 99826 · last May 30, first Sep 16
- Auke Bay, AK 99821 · last May 21, first Oct 1
- Elfin Cove, AK 99825 · last Apr 26, first Nov 1
Frequently asked questions
- When is the last frost in Tenakee Springs, AK?
- For ZIP code 99841, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Hoonah, AK weather station. There is a 1-in-10 chance of a frost after July 4.
- When is the first frost in Tenakee Springs, AK?
- The average first fall frost (32°F) is October 4. 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 99841?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 145 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.