Frost dates for 97904Drewsey, OR
The average last spring frost in Drewsey is June 5 and the average first fall frost is September 5, giving a typical growing season of about 91 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 5
- Average first fall frost
- Sep 5
- Growing season
- 91 days
Safer after Jun 26 (1-in-10 risk)
Possible by Aug 20 (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) | — | — | 60 days | 100% |
| Frost / freeze (32°F) | May 17 · Jun 5 · Jun 26 | Aug 20 · Sep 5 · Sep 21 | 91 days | 100% |
| Hard freeze (28°F) | May 2 · May 18 · Jun 10 | Sep 1 · Sep 17 · Oct 1 | 122 days | 100% |
Planting calendar for Drewsey
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 | May 5 – Jul 11 |
| Tomatoes | Transplant outdoors | Jun 21 – May 16 |
| Peppers | Start seeds indoors | May 5 – Jun 5 |
| Peppers | Transplant outdoors | Jul 5 – Aug 5 |
| Eggplant | Start seeds indoors | May 22 – Jun 20 |
| Eggplant | Transplant outdoors | Jul 5 – Aug 5 |
| Cucumbers | Sow outdoors | Jul 5 – May 26 |
| Summer squash | Sow outdoors | Jun 21 – Aug 5 |
| Winter squash & pumpkins | Sow outdoors | Jul 5 – Aug 5 |
| Snap beans | Sow outdoors | Jun 21 – Jun 18 |
| Sweet corn | Sow outdoors | Jun 21 – May 16 |
| Watermelon & cantaloupe | Sow outdoors | Jul 5 – Aug 5 |
| Okra | Sow outdoors | Jun 28 – Jul 21 |
| Peas | Sow outdoors (spring) | May 5 – Jun 20 |
| Potatoes | Plant outdoors (spring) | May 5 – Jul 5 |
| Onions | Start seeds indoors (spring) | Mar 24 – Apr 20 |
| Onions | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (spring) | Apr 17 – May 21 |
| Broccoli | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (fall) | May 6 – May 16 |
| Broccoli | Transplant outdoors (fall) | Jun 5 – Jun 16 |
| Cabbage | Start seeds indoors (spring) | Apr 7 – May 5 |
| Cabbage | Transplant outdoors (spring) | May 5 – Jun 5 |
| Cabbage | Start seeds indoors (fall) | Apr 26 – May 26 |
| Cabbage | Transplant outdoors (fall) | May 26 – Jun 26 |
| Leaf lettuce | Sow outdoors (spring) | May 5 – Jul 21 |
| Leaf lettuce | Sow outdoors (fall) | May 26 – Jul 12 |
| Spinach | Sow outdoors (spring) | Apr 28 – Jun 11 |
| Spinach | Sow outdoors (fall) | Jun 12 – Jul 17 |
| Radishes | Sow outdoors (spring) | May 5 – Jun 25 |
| Radishes | Sow outdoors (fall) | May 26 – Jul 27 |
| Kale | Sow outdoors (spring) | May 22 – Jun 11 |
| Kale | Sow outdoors (fall) | May 19 – Jun 26 |
| Carrots | Sow outdoors (spring) | Jun 5 – Jul 21 |
| Carrots | Sow outdoors (fall) | Apr 26 – Jun 11 |
| Garlic | Plant outdoors (fall) | Aug 26 – Sep 26 |
Where these dates come from
ZIP code 97904 is matched to the NOAA station Drewsey, OR, 9.7 km away, at 3,515 ft elevation (327 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Drewsey, OR (used) | 3,515 ft | Jun 5 | Sep 5 |
| Burns Muni Ap, OR | 4,140 ft | Jun 11 | Sep 6 |
| Riverside 7 Ssw, OR | 3,380 ft | Jun 7 | Sep 6 |
| Seneca, OR | 4,660 ft | — | — |
Frost dates near Drewsey
- Juntura, OR 97911 · last Jun 5, first Sep 5
- Crane, OR 97732 · last Jun 11, first Sep 6
- Riverside, OR 97917 · last Jun 7, first Sep 6
- Seneca, OR 97873 · last —, first —
- Hines, OR 97738 · last Jun 11, first Sep 6
- Burns, OR 97720 · last Jun 11, first Sep 6
- Ironside, OR 97908 · last —, first —
- Westfall, OR 97920 · last May 7, first Oct 3
Frequently asked questions
- When is the last frost in Drewsey, OR?
- For ZIP code 97904, the average last spring frost (32°F) is June 5, based on NOAA 1991-2020 climate normals for the Drewsey, OR weather station. There is a 1-in-10 chance of a frost after June 26.
- When is the first frost in Drewsey, OR?
- The average first fall frost (32°F) is September 5. There is a 1-in-10 chance of frost by August 20, so tender plants are at risk from that point on.
- How long is the growing season in 97904?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 91 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.