Frost dates for 97913Nyssa, OR
The average last spring frost in Nyssa is April 18 and the average first fall frost is October 18, giving a typical growing season of about 182 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Oct 18
- Growing season
- 182 days
Safer after May 4 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 167 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 17 · May 1 · May 19 | Sep 26 · Oct 6 · Oct 19 | 157 days | 100% |
| Frost / freeze (32°F) | Mar 30 · Apr 18 · May 4 | Oct 4 · Oct 18 · Nov 1 | 182 days | 100% |
| Hard freeze (28°F) | Mar 9 · Mar 31 · Apr 20 | Oct 14 · Oct 28 · Nov 13 | 210 days | 100% |
Planting calendar for Nyssa
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 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jun 28 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 8 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Jul 31 |
| Sweet corn | Sow outdoors | May 4 – Jun 28 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jun 18 – Jun 28 |
| Broccoli | Transplant outdoors (fall) | Jul 18 – Jul 29 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 8 – Jul 8 |
| Cabbage | Transplant outdoors (fall) | Jul 8 – Aug 8 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 8 – Aug 24 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Jul 25 – Aug 29 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 8 – Sep 8 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 1 – Aug 8 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 8 – Jul 24 |
| Garlic | Plant outdoors (fall) | Oct 8 – Nov 8 |
Where these dates come from
ZIP code 97913 is matched to the NOAA station Nyssa, OR, 3.3 km away, at 2,175 ft elevation (23 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Nyssa, OR (used) | 2,175 ft | Apr 18 | Oct 18 |
| Parma Exp Stn, ID | 2,290 ft | Apr 27 | Oct 9 |
| Malheur Branch Exp Stn, OR | 2,260 ft | Apr 23 | Oct 13 |
| Ontario Muni Ap, OR | 2,190 ft | Apr 21 | Oct 14 |
Frost dates near Nyssa
- Parma, ID 83660 · last Apr 27, first Oct 9
- Fruitland, ID 83619 · last Apr 21, first Oct 14
- Ontario, OR 97914 · last Apr 22, first Oct 9
- New Plymouth, ID 83655 · last Apr 23, first Oct 13
- Adrian, OR 97901 · last Apr 24, first Oct 9
- Notus, ID 83656 · last Apr 27, first Oct 9
- Caldwell, ID 83606 · last Apr 27, first Oct 9
- Wilder, ID 83676 · last Apr 24, first Oct 9
Frequently asked questions
- When is the last frost in Nyssa, OR?
- For ZIP code 97913, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Nyssa, OR weather station. There is a 1-in-10 chance of a frost after May 4.
- When is the first frost in Nyssa, OR?
- The average first fall frost (32°F) is October 18. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 97913?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 182 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.