Frost dates for 97873Seneca, OR
Frost is possible in any month near Seneca, based on NOAA 1991-2020 records for the Seneca, OR station.
Frost is possible in any month. Even summer nights can drop to freezing at this station, so protect tender plants whenever cold nights are forecast.
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) | — | — | 12 days | 100% |
| Frost / freeze (32°F) | — | — | 24 days | 100% |
| Hard freeze (28°F) | — | — | 52 days | 100% |
Where these dates come from
ZIP code 97873 is matched to the NOAA station Seneca, OR, 0.5 km away, at 4,660 ft elevation (15 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Seneca, OR (used) | 4,660 ft | — | — |
| John Day, OR | 3,063 ft | May 28 | Sep 18 |
| Drewsey, OR | 3,515 ft | Jun 5 | Sep 5 |
| Burns Muni Ap, OR | 4,140 ft | Jun 11 | Sep 6 |
Frost dates near Seneca
- Canyon City, OR 97820 · last May 28, first Sep 18
- John Day, OR 97845 · last May 28, first Sep 18
- Mount Vernon, OR 97865 · last May 28, first Sep 18
- Prairie City, OR 97869 · last May 28, first Sep 18
- Drewsey, OR 97904 · last Jun 5, first Sep 5
- Dayville, OR 97825 · last May 4, first Oct 6
- Hines, OR 97738 · last Jun 11, first Sep 6
- Paulina, OR 97751 · last Jun 2, first Sep 17
Frequently asked questions
- When is the last frost in Seneca, OR?
- Frost is possible in any month at the nearest NOAA station (Seneca, OR), so there is no reliable average last frost date.
- When is the first frost in Seneca, OR?
- Frost is possible in any month at the nearest NOAA station.
- 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.