Frost dates for 97761Warm Springs, OR
The average last spring frost in Warm Springs is May 5 and the average first fall frost is October 7, giving a typical growing season of about 154 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 5
- Average first fall frost
- Oct 7
- Growing season
- 154 days
Safer after May 29 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 185 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) | May 8 · May 28 · Jun 20 | Sep 7 · Sep 26 · Oct 8 | 119 days | 100% |
| Frost / freeze (32°F) | Apr 21 · May 5 · May 29 | Sep 24 · Oct 7 · Oct 22 | 154 days | 100% |
| Hard freeze (28°F) | Mar 30 · Apr 20 · May 7 | Oct 4 · Oct 20 · Nov 4 | 182 days | 100% |
Planting calendar for Warm 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 4 – Jun 10 |
| Tomatoes | Transplant outdoors | May 21 – Jun 17 |
| Peppers | Start seeds indoors | Apr 4 – May 5 |
| Peppers | Transplant outdoors | Jun 4 – Jul 5 |
| Eggplant | Start seeds indoors | Apr 21 – May 20 |
| Eggplant | Transplant outdoors | Jun 4 – Jul 5 |
| Cucumbers | Sow outdoors | Jun 4 – Jun 27 |
| Summer squash | Sow outdoors | May 21 – Jul 5 |
| Winter squash & pumpkins | Sow outdoors | Jun 4 – Jul 5 |
| Snap beans | Sow outdoors | May 21 – Jul 20 |
| Sweet corn | Sow outdoors | May 21 – Jun 17 |
| Watermelon & cantaloupe | Sow outdoors | Jun 4 – Jul 5 |
| Okra | Sow outdoors | May 28 – Jun 20 |
| Peas | Sow outdoors (spring) | Apr 4 – May 20 |
| Potatoes | Plant outdoors (spring) | Apr 4 – Jun 4 |
| Onions | Start seeds indoors (spring) | Feb 21 – Mar 20 |
| Onions | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (spring) | Mar 17 – Apr 20 |
| Broccoli | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (fall) | Jun 7 – Jun 17 |
| Broccoli | Transplant outdoors (fall) | Jul 7 – Jul 18 |
| Cabbage | Start seeds indoors (spring) | Mar 7 – Apr 4 |
| Cabbage | Transplant outdoors (spring) | Apr 4 – May 5 |
| Cabbage | Start seeds indoors (fall) | May 28 – Jun 27 |
| Cabbage | Transplant outdoors (fall) | Jun 27 – Jul 28 |
| Leaf lettuce | Sow outdoors (spring) | Apr 4 – Jun 20 |
| Leaf lettuce | Sow outdoors (fall) | Jun 27 – Aug 13 |
| Spinach | Sow outdoors (spring) | Mar 28 – May 11 |
| Spinach | Sow outdoors (fall) | Jul 14 – Aug 18 |
| Radishes | Sow outdoors (spring) | Apr 4 – May 25 |
| Radishes | Sow outdoors (fall) | Jun 27 – Aug 28 |
| Kale | Sow outdoors (spring) | Apr 21 – May 11 |
| Kale | Sow outdoors (fall) | Jun 20 – Jul 28 |
| Carrots | Sow outdoors (spring) | May 5 – Jun 20 |
| Carrots | Sow outdoors (fall) | May 28 – Jul 13 |
| Garlic | Plant outdoors (fall) | Sep 27 – Oct 28 |
Where these dates come from
ZIP code 97761 is matched to the NOAA station Pelton Dam, OR, 3.8 km away, at 1,410 ft elevation (198 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pelton Dam, OR (used) | 1,410 ft | May 5 | Oct 7 |
| Madras 2 N, OR | 2,443 ft | May 19 | Oct 4 |
| Madras, OR | 2,230 ft | — | — |
| Grizzly, OR | 3,635 ft | — | — |
Frost dates near Warm Springs
- Madras, OR 97741 · last —, first —
- Culver, OR 97734 · last Jun 9, first Sep 14
- Maupin, OR 97037 · last —, first —
- Terrebonne, OR 97760 · last Jun 9, first Sep 14
- Camp Sherman, OR 97730 · last —, first —
- Antelope, OR 97001 · last May 22, first Oct 3
- Ashwood, OR 97711 · last —, first —
- Sisters, OR 97759 · last —, first —
Frequently asked questions
- When is the last frost in Warm Springs, OR?
- For ZIP code 97761, the average last spring frost (32°F) is May 5, based on NOAA 1991-2020 climate normals for the Pelton Dam, OR weather station. There is a 1-in-10 chance of a frost after May 29.
- When is the first frost in Warm Springs, OR?
- The average first fall frost (32°F) is October 7. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 97761?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 154 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.