Frost dates for 97466Powers, OR
The average last spring frost in Powers is March 21 and the average first fall frost is November 14, giving a typical growing season of about 241 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 21
- Average first fall frost
- Nov 14
- Growing season
- 241 days
Safer after Apr 12 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 12 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) | Mar 31 · Apr 20 · May 9 | Oct 1 · Oct 22 · Nov 14 | 183 days | 100% |
| Frost / freeze (32°F) | Feb 16 · Mar 21 · Apr 12 | Oct 21 · Nov 14 · Dec 14 | 241 days | 100% |
| Hard freeze (28°F) | Dec 17 · Feb 6 · Mar 18 | Nov 7 · Dec 9 · Jan 30 | 310 days | 92% |
Planting calendar for Powers
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 | Feb 18 – Apr 26 |
| Tomatoes | Transplant outdoors | Apr 6 – Jul 25 |
| Peppers | Start seeds indoors | Feb 18 – Mar 21 |
| Peppers | Transplant outdoors | Apr 20 – May 21 |
| Eggplant | Start seeds indoors | Mar 7 – Apr 5 |
| Eggplant | Transplant outdoors | Apr 20 – May 21 |
| Cucumbers | Sow outdoors | Apr 20 – Aug 4 |
| Summer squash | Sow outdoors | Apr 6 – May 21 |
| Winter squash & pumpkins | Sow outdoors | Apr 20 – May 21 |
| Snap beans | Sow outdoors | Apr 6 – Aug 27 |
| Sweet corn | Sow outdoors | Apr 6 – Jul 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 20 – May 21 |
| Okra | Sow outdoors | Apr 13 – May 6 |
| Peas | Sow outdoors (spring) | Feb 18 – Apr 5 |
| Potatoes | Plant outdoors (spring) | Feb 18 – Apr 20 |
| Onions | Start seeds indoors (spring) | Jan 7 – Feb 3 |
| Onions | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (spring) | Jan 31 – Mar 6 |
| Broccoli | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (fall) | Jul 15 – Jul 25 |
| Broccoli | Transplant outdoors (fall) | Aug 14 – Aug 25 |
| Cabbage | Start seeds indoors (spring) | Jan 21 – Feb 18 |
| Cabbage | Transplant outdoors (spring) | Feb 18 – Mar 21 |
| Cabbage | Start seeds indoors (fall) | Jul 5 – Aug 4 |
| Cabbage | Transplant outdoors (fall) | Aug 4 – Sep 4 |
| Leaf lettuce | Sow outdoors (spring) | Feb 18 – May 6 |
| Leaf lettuce | Sow outdoors (fall) | Aug 4 – Sep 20 |
| Spinach | Sow outdoors (spring) | Feb 11 – Mar 27 |
| Spinach | Sow outdoors (fall) | Aug 21 – Sep 25 |
| Radishes | Sow outdoors (spring) | Feb 18 – Apr 10 |
| Radishes | Sow outdoors (fall) | Aug 4 – Oct 5 |
| Kale | Sow outdoors (spring) | Mar 7 – Mar 27 |
| Kale | Sow outdoors (fall) | Jul 28 – Sep 4 |
| Carrots | Sow outdoors (spring) | Mar 21 – May 6 |
| Carrots | Sow outdoors (fall) | Jul 5 – Aug 20 |
| Garlic | Plant outdoors (fall) | Nov 4 – Dec 5 |
Where these dates come from
ZIP code 97466 is matched to the NOAA station Powers, OR, 1 km away, at 230 ft elevation (52 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Powers, OR (used) | 230 ft | Mar 21 | Nov 14 |
| Illahe, OR | 348 ft | Mar 30 | Nov 17 |
| Langlois #2, OR | 90 ft | Mar 16 | Nov 29 |
| Coquille City, OR | 23 ft | Mar 28 | Nov 6 |
Frost dates near Powers
- Broadbent, OR 97414 · last Mar 21, first Nov 14
- Myrtle Point, OR 97458 · last Mar 21, first Nov 14
- Langlois, OR 97450 · last Mar 16, first Nov 29
- Sixes, OR 97476 · last Mar 16, first Nov 29
- Agness, OR 97406 · last Mar 30, first Nov 17
- Coquille, OR 97423 · last Mar 28, first Nov 6
- Bandon, OR 97411 · last Mar 9, first Nov 27
- Port Orford, OR 97465 · last Feb 17, first Dec 3
Frequently asked questions
- When is the last frost in Powers, OR?
- For ZIP code 97466, the average last spring frost (32°F) is March 21, based on NOAA 1991-2020 climate normals for the Powers, OR weather station. There is a 1-in-10 chance of a frost after April 12.
- When is the first frost in Powers, OR?
- The average first fall frost (32°F) is November 14. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 97466?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 241 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.