Frost dates for 97910Jordan Valley, OR
The average last spring frost in Jordan Valley is May 22 and the average first fall frost is September 28, giving a typical growing season of about 126 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 28
- Growing season
- 126 days
Safer after Jun 14 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 201 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) | May 22 · Jun 9 · Jun 28 | Sep 1 · Sep 16 · Oct 1 | 97 days | 100% |
| Frost / freeze (32°F) | May 3 · May 22 · Jun 14 | Sep 11 · Sep 28 · Oct 13 | 126 days | 100% |
| Hard freeze (28°F) | Apr 18 · May 3 · May 27 | Sep 26 · Oct 10 · Oct 28 | 157 days | 100% |
Planting calendar for Jordan Valley
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 | Apr 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 8 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 18 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 11 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 8 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | May 29 – Jun 8 |
| Broccoli | Transplant outdoors (fall) | Jun 28 – Jul 9 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 19 – Jun 18 |
| Cabbage | Transplant outdoors (fall) | Jun 18 – Jul 19 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 18 – Aug 4 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 5 – Aug 9 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 18 – Aug 19 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 11 – Jul 19 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 19 – Jul 4 |
| Garlic | Plant outdoors (fall) | Sep 18 – Oct 19 |
Where these dates come from
ZIP code 97910 is matched to the NOAA station Sheaville 1 Se, OR, 33.2 km away, at 4,620 ft elevation (240 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sheaville 1 Se, OR (used) | 4,620 ft | May 22 | Sep 28 |
| Rome 2 Nw, OR | 3,405 ft | Jun 11 | Sep 10 |
| Silver City 5 W, ID | 6,160 ft | May 31 | Oct 6 |
| Rockville 5 N, OR | 3,670 ft | May 29 | Sep 14 |
Frost dates near Jordan Valley
- Arock, OR 97902 · last Jun 11, first Sep 10
- Murphy, ID 83650 · last May 31, first Oct 6
- Melba, ID 83641 · last Apr 29, first Oct 13
- Marsing, ID 83639 · last Apr 24, first Oct 9
- Homedale, ID 83628 · last Apr 24, first Oct 9
- Adrian, OR 97901 · last Apr 24, first Oct 9
- Nampa, ID 83653 · last Apr 23, first Oct 18
- Huston, ID 83630 · last Apr 23, first Oct 18
Frequently asked questions
- When is the last frost in Jordan Valley, OR?
- For ZIP code 97910, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Sheaville 1 Se, OR weather station. There is a 1-in-10 chance of a frost after June 14.
- When is the first frost in Jordan Valley, OR?
- The average first fall frost (32°F) is September 28. There is a 1-in-10 chance of frost by September 11, so tender plants are at risk from that point on.
- How long is the growing season in 97910?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 126 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.