Frost dates for 97324Alsea, OR
The average last spring frost in Alsea is April 13 and the average first fall frost is November 3, giving a typical growing season of about 202 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 13
- Average first fall frost
- Nov 3
- Growing season
- 202 days
Safer after May 3 (1-in-10 risk)
Possible by Oct 9 (1-in-10 risk)
First frost typically in 2 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) | Apr 23 · May 7 · May 28 | Sep 22 · Oct 11 · Nov 3 | 155 days | 100% |
| Frost / freeze (32°F) | Mar 17 · Apr 13 · May 3 | Oct 9 · Nov 3 · Dec 3 | 202 days | 100% |
| Hard freeze (28°F) | Jan 5 · Feb 28 · Mar 31 | Oct 31 · Nov 28 · Jan 4 | 272 days | 99% |
Planting calendar for Alsea
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 | Mar 13 – May 19 |
| Tomatoes | Transplant outdoors | Apr 29 – Jul 14 |
| Peppers | Start seeds indoors | Mar 13 – Apr 13 |
| Peppers | Transplant outdoors | May 13 – Jun 13 |
| Eggplant | Start seeds indoors | Mar 30 – Apr 28 |
| Eggplant | Transplant outdoors | May 13 – Jun 13 |
| Cucumbers | Sow outdoors | May 13 – Jul 24 |
| Summer squash | Sow outdoors | Apr 29 – Jun 13 |
| Winter squash & pumpkins | Sow outdoors | May 13 – Jun 13 |
| Snap beans | Sow outdoors | Apr 29 – Aug 16 |
| Sweet corn | Sow outdoors | Apr 29 – Jul 14 |
| Watermelon & cantaloupe | Sow outdoors | May 13 – Jun 13 |
| Okra | Sow outdoors | May 6 – May 29 |
| Peas | Sow outdoors (spring) | Mar 13 – Apr 28 |
| Potatoes | Plant outdoors (spring) | Mar 13 – May 13 |
| Onions | Start seeds indoors (spring) | Jan 30 – Feb 26 |
| Onions | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (spring) | Feb 23 – Mar 29 |
| Broccoli | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (fall) | Jul 4 – Jul 14 |
| Broccoli | Transplant outdoors (fall) | Aug 3 – Aug 14 |
| Cabbage | Start seeds indoors (spring) | Feb 13 – Mar 13 |
| Cabbage | Transplant outdoors (spring) | Mar 13 – Apr 13 |
| Cabbage | Start seeds indoors (fall) | Jun 24 – Jul 24 |
| Cabbage | Transplant outdoors (fall) | Jul 24 – Aug 24 |
| Leaf lettuce | Sow outdoors (spring) | Mar 13 – May 29 |
| Leaf lettuce | Sow outdoors (fall) | Jul 24 – Sep 9 |
| Spinach | Sow outdoors (spring) | Mar 6 – Apr 19 |
| Spinach | Sow outdoors (fall) | Aug 10 – Sep 14 |
| Radishes | Sow outdoors (spring) | Mar 13 – May 3 |
| Radishes | Sow outdoors (fall) | Jul 24 – Sep 24 |
| Kale | Sow outdoors (spring) | Mar 30 – Apr 19 |
| Kale | Sow outdoors (fall) | Jul 17 – Aug 24 |
| Carrots | Sow outdoors (spring) | Apr 13 – May 29 |
| Carrots | Sow outdoors (fall) | Jun 24 – Aug 9 |
| Garlic | Plant outdoors (fall) | Oct 24 – Nov 24 |
Where these dates come from
ZIP code 97324 is matched to the NOAA station Alsea Fh (Fall Creek), OR, 12.1 km away, at 230 ft elevation (75 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Alsea Fh (Fall Creek), OR (used) | 230 ft | Apr 13 | Nov 3 |
| Corvallis Water Bureau, OR | 592 ft | May 15 | Oct 8 |
| Corvallis 10 Ssw, OR | 312 ft | Apr 11 | Oct 30 |
| Yachats, OR | 50 ft | Feb 19 | Dec 11 |
Frost dates near Alsea
- Blachly, OR 97412 · last Apr 18, first Oct 25
- Monroe, OR 97456 · last Apr 11, first Oct 23
- Tidewater, OR 97390 · last Feb 19, first Dec 11
- Deadwood, OR 97430 · last Apr 18, first Oct 25
- Philomath, OR 97370 · last May 15, first Oct 8
- Cheshire, OR 97419 · last Apr 18, first Oct 25
- Blodgett, OR 97326 · last May 15, first Oct 8
- Seal Rock, OR 97376 · last May 15, first Oct 8
Frequently asked questions
- When is the last frost in Alsea, OR?
- For ZIP code 97324, the average last spring frost (32°F) is April 13, based on NOAA 1991-2020 climate normals for the Alsea Fh (Fall Creek), OR weather station. There is a 1-in-10 chance of a frost after May 3.
- When is the first frost in Alsea, OR?
- The average first fall frost (32°F) is November 3. There is a 1-in-10 chance of frost by October 9, so tender plants are at risk from that point on.
- How long is the growing season in 97324?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 202 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.