Frost dates for 97760Terrebonne, OR
The average last spring frost in Terrebonne is June 9 and the average first fall frost is September 14, giving a typical growing season of about 98 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 9
- Average first fall frost
- Sep 14
- Growing season
- 98 days
Safer after Jun 26 (1-in-10 risk)
Possible by Sep 1 (1-in-10 risk)
Last frost typically in 220 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) | — | — | 63 days | 100% |
| Frost / freeze (32°F) | May 17 · Jun 9 · Jun 26 | Sep 1 · Sep 14 · Oct 1 | 98 days | 100% |
| Hard freeze (28°F) | Apr 28 · May 14 · Jun 9 | Sep 14 · Sep 30 · Oct 15 | 134 days | 100% |
Planting calendar for Terrebonne
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 9 – Jul 15 |
| Tomatoes | Transplant outdoors | Jun 25 – May 25 |
| Peppers | Start seeds indoors | May 9 – Jun 9 |
| Peppers | Transplant outdoors | Jul 9 – Aug 9 |
| Eggplant | Start seeds indoors | May 26 – Jun 24 |
| Eggplant | Transplant outdoors | Jul 9 – Aug 9 |
| Cucumbers | Sow outdoors | Jul 9 – Jun 4 |
| Summer squash | Sow outdoors | Jun 25 – Aug 9 |
| Winter squash & pumpkins | Sow outdoors | Jul 9 – Aug 9 |
| Snap beans | Sow outdoors | Jun 25 – Jun 27 |
| Sweet corn | Sow outdoors | Jun 25 – May 25 |
| Watermelon & cantaloupe | Sow outdoors | Jul 9 – Aug 9 |
| Okra | Sow outdoors | Jul 2 – Jul 25 |
| Peas | Sow outdoors (spring) | May 9 – Jun 24 |
| Potatoes | Plant outdoors (spring) | May 9 – Jul 9 |
| Onions | Start seeds indoors (spring) | Mar 28 – Apr 24 |
| Onions | Transplant outdoors (spring) | May 26 – Jun 24 |
| Broccoli | Start seeds indoors (spring) | Apr 21 – May 25 |
| Broccoli | Transplant outdoors (spring) | May 26 – Jun 24 |
| Broccoli | Start seeds indoors (fall) | May 15 – May 25 |
| Broccoli | Transplant outdoors (fall) | Jun 14 – Jun 25 |
| Cabbage | Start seeds indoors (spring) | Apr 11 – May 9 |
| Cabbage | Transplant outdoors (spring) | May 9 – Jun 9 |
| Cabbage | Start seeds indoors (fall) | May 5 – Jun 4 |
| Cabbage | Transplant outdoors (fall) | Jun 4 – Jul 5 |
| Leaf lettuce | Sow outdoors (spring) | May 9 – Jul 25 |
| Leaf lettuce | Sow outdoors (fall) | Jun 4 – Jul 21 |
| Spinach | Sow outdoors (spring) | May 2 – Jun 15 |
| Spinach | Sow outdoors (fall) | Jun 21 – Jul 26 |
| Radishes | Sow outdoors (spring) | May 9 – Jun 29 |
| Radishes | Sow outdoors (fall) | Jun 4 – Aug 5 |
| Kale | Sow outdoors (spring) | May 26 – Jun 15 |
| Kale | Sow outdoors (fall) | May 28 – Jul 5 |
| Carrots | Sow outdoors (spring) | Jun 9 – Jul 25 |
| Carrots | Sow outdoors (fall) | May 5 – Jun 20 |
| Garlic | Plant outdoors (fall) | Sep 4 – Oct 5 |
Where these dates come from
ZIP code 97760 is matched to the NOAA station Redmond Roberts Fld, OR, 17 km away, at 3,043 ft elevation (254 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Redmond Roberts Fld, OR (used) | 3,043 ft | Jun 9 | Sep 14 |
| Sisters, OR | 3,180 ft | — | — |
| Grizzly, OR | 3,635 ft | — | — |
| Bend 7 Ne, OR | 3,358 ft | — | — |
Frost dates near Terrebonne
- Culver, OR 97734 · last Jun 9, first Sep 14
- Redmond, OR 97756 · last Jun 9, first Sep 14
- Sisters, OR 97759 · last —, first —
- Powell Butte, OR 97753 · last Jun 9, first Sep 14
- Madras, OR 97741 · last —, first —
- Camp Sherman, OR 97730 · last —, first —
- Bend, OR 97701 · last Jun 6, first Sep 20
- Prineville, OR 97754 · last Jun 1, first Sep 22
Frequently asked questions
- When is the last frost in Terrebonne, OR?
- For ZIP code 97760, the average last spring frost (32°F) is June 9, based on NOAA 1991-2020 climate normals for the Redmond Roberts Fld, OR weather station. There is a 1-in-10 chance of a frost after June 26.
- When is the first frost in Terrebonne, OR?
- The average first fall frost (32°F) is September 14. There is a 1-in-10 chance of frost by September 1, so tender plants are at risk from that point on.
- How long is the growing season in 97760?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 98 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.