Frost dates for 97909Jamieson, OR
The average last spring frost in Jamieson is April 23 and the average first fall frost is October 13, giving a typical growing season of about 172 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 23
- Average first fall frost
- Oct 13
- Growing season
- 172 days
Safer after May 7 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 173 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) | Apr 21 · May 5 · May 31 | Sep 21 · Oct 3 · Oct 15 | 148 days | 100% |
| Frost / freeze (32°F) | Apr 8 · Apr 23 · May 7 | Oct 1 · Oct 13 · Oct 25 | 172 days | 100% |
| Hard freeze (28°F) | Mar 17 · Apr 6 · Apr 25 | Oct 11 · Oct 23 · Nov 6 | 199 days | 100% |
Planting calendar for Jamieson
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 | Mar 23 – May 29 |
| Tomatoes | Transplant outdoors | May 9 – Jun 23 |
| Peppers | Start seeds indoors | Mar 23 – Apr 23 |
| Peppers | Transplant outdoors | May 23 – Jun 23 |
| Eggplant | Start seeds indoors | Apr 9 – May 8 |
| Eggplant | Transplant outdoors | May 23 – Jun 23 |
| Cucumbers | Sow outdoors | May 23 – Jul 3 |
| Summer squash | Sow outdoors | May 9 – Jun 23 |
| Winter squash & pumpkins | Sow outdoors | May 23 – Jun 23 |
| Snap beans | Sow outdoors | May 9 – Jul 26 |
| Sweet corn | Sow outdoors | May 9 – Jun 23 |
| Watermelon & cantaloupe | Sow outdoors | May 23 – Jun 23 |
| Okra | Sow outdoors | May 16 – Jun 8 |
| Peas | Sow outdoors (spring) | Mar 23 – May 8 |
| Potatoes | Plant outdoors (spring) | Mar 23 – May 23 |
| Onions | Start seeds indoors (spring) | Feb 9 – Mar 8 |
| Onions | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (spring) | Mar 5 – Apr 8 |
| Broccoli | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (fall) | Jun 13 – Jun 23 |
| Broccoli | Transplant outdoors (fall) | Jul 13 – Jul 24 |
| Cabbage | Start seeds indoors (spring) | Feb 23 – Mar 23 |
| Cabbage | Transplant outdoors (spring) | Mar 23 – Apr 23 |
| Cabbage | Start seeds indoors (fall) | Jun 3 – Jul 3 |
| Cabbage | Transplant outdoors (fall) | Jul 3 – Aug 3 |
| Leaf lettuce | Sow outdoors (spring) | Mar 23 – Jun 8 |
| Leaf lettuce | Sow outdoors (fall) | Jul 3 – Aug 19 |
| Spinach | Sow outdoors (spring) | Mar 16 – Apr 29 |
| Spinach | Sow outdoors (fall) | Jul 20 – Aug 24 |
| Radishes | Sow outdoors (spring) | Mar 23 – May 13 |
| Radishes | Sow outdoors (fall) | Jul 3 – Sep 3 |
| Kale | Sow outdoors (spring) | Apr 9 – Apr 29 |
| Kale | Sow outdoors (fall) | Jun 26 – Aug 3 |
| Carrots | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Carrots | Sow outdoors (fall) | Jun 3 – Jul 19 |
| Garlic | Plant outdoors (fall) | Oct 3 – Nov 3 |
Where these dates come from
ZIP code 97909 is matched to the NOAA station Huntington, OR, 23.8 km away, at 2,110 ft elevation (423 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Huntington, OR (used) | 2,110 ft | Apr 23 | Oct 13 |
| Westfall, OR | 3,040 ft | May 7 | Oct 3 |
| Vale, OR | 2,240 ft | May 8 | Sep 29 |
| Weiser, ID | 2,120 ft | Apr 23 | Oct 13 |
Frost dates near Jamieson
- Brogan, OR 97903 · last May 7, first Oct 3
- Huntington, OR 97907 · last Apr 23, first Oct 13
- Vale, OR 97918 · last May 8, first Sep 29
- Westfall, OR 97920 · last May 7, first Oct 3
- Durkee, OR 97905 · last May 25, first Sep 15
- Ironside, OR 97908 · last —, first —
- Bridgeport, OR 97819 · last May 25, first Sep 15
- Harper, OR 97906 · last May 7, first Oct 5
Frequently asked questions
- When is the last frost in Jamieson, OR?
- For ZIP code 97909, the average last spring frost (32°F) is April 23, based on NOAA 1991-2020 climate normals for the Huntington, OR weather station. There is a 1-in-10 chance of a frost after May 7.
- When is the first frost in Jamieson, OR?
- The average first fall frost (32°F) is October 13. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 97909?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 172 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.