Sisters, OR frost dates
Last spring frostAny monthno frost-free season
Freezing nights202 / yrat or below 32°F
Hardiness zone7aZone 7a
Gardening where frost is possible all year
The weather station nearest Sisters, OR records freezing temperatures in every month often enough that NOAA cannot define a frost-free season. Gardening is still possible — it just means planning for frost at any time:
- Grow fast, cold-tolerant crops: Radishes, Lettuce, Spinach, Kale, Peas, Potatoes, Swiss Chard, Garlic.
- Plant once the soil can be worked — usually late spring to early summer at high elevation — and keep row covers ready for clear, still nights.
- Use season extension: cold frames, low tunnels, wall-of-water cloches or a greenhouse turn a few frost-free weeks into a real season.
- Frost-tender crops (tomatoes, squash, beans) need protection all season; choose the earliest varieties you can find.
How Sisters compares
- Nearby Bend, OR, 31 km away, has a regular frost season (last frost Jun 6), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Sisters, OR weather station, 5 km away (elevation 3,179 ft (969 m)).
Frost dates near Sisters
- Camp Sherman frost any month
- Terrebonne Jun 9 · Sep 14
- Redmond Jun 9 · Sep 14
- Culver May 19 · Oct 4
- Bend Jun 6 · Sep 20
- Powell Butte Jun 9 · Sep 14
- Madras May 19 · Oct 4
- Warm Springs May 5 · Oct 7
- Blue River May 1 · Oct 10
- Bend (Deschutes) frost any month
Frequently asked questions
When is the last frost in Sisters, OR?
Sisters, OR can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 202 nights a year at or below 32°F.
What can I grow in Sisters, OR?
Fast, cold-tolerant crops such as radishes, lettuce, spinach, kale, peas and potatoes, ideally under row covers, cold frames or a greenhouse. Frost-tender crops like tomatoes need protection all season.