Frost dates for 97759Sisters, OR
Frost is possible in any month near Sisters, based on NOAA 1991-2020 records for the Sisters, 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) | — | — | 28 days | 100% |
| Frost / freeze (32°F) | — | — | 57 days | 100% |
| Hard freeze (28°F) | May 17 · Jun 8 · Jul 3 | Aug 25 · Sep 13 · Oct 1 | 97 days | 100% |
Where these dates come from
ZIP code 97759 is matched to the NOAA station Sisters, OR, 4.8 km away, at 3,180 ft elevation (70 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sisters, OR (used) | 3,180 ft | — | — |
| Redmond Roberts Fld, OR | 3,043 ft | Jun 9 | Sep 14 |
| Bend 7 Ne, OR | 3,358 ft | — | — |
| Bend, OR | 3,660 ft | Jun 6 | Sep 20 |
Frost dates near Sisters
- Camp Sherman, OR 97730 · last —, first —
- Terrebonne, OR 97760 · last Jun 9, first Sep 14
- Redmond, OR 97756 · last Jun 9, first Sep 14
- Bend, OR 97703 · last Jun 6, first Sep 20
- Culver, OR 97734 · last Jun 9, first Sep 14
- Powell Butte, OR 97753 · last Jun 9, first Sep 14
- Madras, OR 97741 · last —, first —
- Warm Springs, OR 97761 · last May 5, first Oct 7
Frequently asked questions
- When is the last frost in Sisters, OR?
- Frost is possible in any month at the nearest NOAA station (Sisters, OR), so there is no reliable average last frost date.
- When is the first frost in Sisters, 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.