Frost dates for 97406Agness, OR
The average last spring frost in Agness is March 30 and the average first fall frost is November 17, giving a typical growing season of about 233 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 30
- Average first fall frost
- Nov 17
- Growing season
- 233 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 20 (1-in-10 risk)
First frost typically in 15 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 14 · May 6 · May 25 | Oct 1 · Oct 26 · Nov 16 | 173 days | 100% |
| Frost / freeze (32°F) | Feb 20 · Mar 30 · May 2 | Oct 20 · Nov 17 · Dec 15 | 233 days | 100% |
| Hard freeze (28°F) | Dec 15 · Feb 1 · Mar 18 | Nov 8 · Dec 10 · Jan 26 | 315 days | 92% |
Planting calendar for Agness
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 | Feb 27 – May 5 |
| Tomatoes | Transplant outdoors | Apr 15 – Jul 28 |
| Peppers | Start seeds indoors | Feb 27 – Mar 30 |
| Peppers | Transplant outdoors | Apr 29 – May 30 |
| Eggplant | Start seeds indoors | Mar 16 – Apr 14 |
| Eggplant | Transplant outdoors | Apr 29 – May 30 |
| Cucumbers | Sow outdoors | Apr 29 – Aug 7 |
| Summer squash | Sow outdoors | Apr 15 – May 30 |
| Winter squash & pumpkins | Sow outdoors | Apr 29 – May 30 |
| Snap beans | Sow outdoors | Apr 15 – Aug 30 |
| Sweet corn | Sow outdoors | Apr 15 – Jul 28 |
| Watermelon & cantaloupe | Sow outdoors | Apr 29 – May 30 |
| Okra | Sow outdoors | Apr 22 – May 15 |
| Peas | Sow outdoors (spring) | Feb 27 – Apr 14 |
| Potatoes | Plant outdoors (spring) | Feb 27 – Apr 29 |
| Onions | Start seeds indoors (spring) | Jan 16 – Feb 12 |
| Onions | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (spring) | Feb 9 – Mar 15 |
| Broccoli | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (fall) | Jul 18 – Jul 28 |
| Broccoli | Transplant outdoors (fall) | Aug 17 – Aug 28 |
| Cabbage | Start seeds indoors (spring) | Jan 30 – Feb 27 |
| Cabbage | Transplant outdoors (spring) | Feb 27 – Mar 30 |
| Cabbage | Start seeds indoors (fall) | Jul 8 – Aug 7 |
| Cabbage | Transplant outdoors (fall) | Aug 7 – Sep 7 |
| Leaf lettuce | Sow outdoors (spring) | Feb 27 – May 15 |
| Leaf lettuce | Sow outdoors (fall) | Aug 7 – Sep 23 |
| Spinach | Sow outdoors (spring) | Feb 20 – Apr 5 |
| Spinach | Sow outdoors (fall) | Aug 24 – Sep 28 |
| Radishes | Sow outdoors (spring) | Feb 27 – Apr 19 |
| Radishes | Sow outdoors (fall) | Aug 7 – Oct 8 |
| Kale | Sow outdoors (spring) | Mar 16 – Apr 5 |
| Kale | Sow outdoors (fall) | Jul 31 – Sep 7 |
| Carrots | Sow outdoors (spring) | Mar 30 – May 15 |
| Carrots | Sow outdoors (fall) | Jul 8 – Aug 23 |
| Garlic | Plant outdoors (fall) | Nov 7 – Dec 8 |
Where these dates come from
ZIP code 97406 is matched to the NOAA station Illahe, OR, 6 km away, at 348 ft elevation (495 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Illahe, OR (used) | 348 ft | Mar 30 | Nov 17 |
| Powers, OR | 230 ft | Mar 21 | Nov 14 |
| Gold Beach Rs, OR | 50 ft | Feb 16 | Dec 16 |
| Port Orford #2, OR | 42 ft | Feb 17 | Dec 3 |
Frost dates near Agness
- Ophir, OR 97464 · last Feb 16, first Dec 16
- Wedderburn, OR 97491 · last Feb 17, first Dec 3
- Powers, OR 97466 · last Mar 21, first Nov 14
- Gold Beach, OR 97444 · last Feb 16, first Dec 16
- Port Orford, OR 97465 · last Feb 17, first Dec 3
- Sixes, OR 97476 · last Mar 16, first Nov 29
- Broadbent, OR 97414 · last Mar 21, first Nov 14
- Wilderville, OR 97543 · last May 1, first Oct 12
Frequently asked questions
- When is the last frost in Agness, OR?
- For ZIP code 97406, the average last spring frost (32°F) is March 30, based on NOAA 1991-2020 climate normals for the Illahe, OR weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Agness, OR?
- The average first fall frost (32°F) is November 17. There is a 1-in-10 chance of frost by October 20, so tender plants are at risk from that point on.
- How long is the growing season in 97406?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 233 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.