Frost dates for 97439Florence, OR
The average last spring frost in Florence is March 28 and the average first fall frost is November 22, giving a typical growing season of about 237 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 28
- Average first fall frost
- Nov 22
- Growing season
- 237 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 28 (1-in-10 risk)
First frost typically in 21 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 7 · Apr 30 · May 20 | Oct 8 · Oct 31 · Nov 23 | 183 days | 100% |
| Frost / freeze (32°F) | Feb 23 · Mar 28 · Apr 21 | Oct 28 · Nov 22 · Dec 20 | 237 days | 100% |
| Hard freeze (28°F) | Dec 21 · Feb 18 · Mar 18 | Nov 13 · Dec 15 · Feb 12 | 308 days | 90% |
Planting calendar for Florence
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 25 – May 3 |
| Tomatoes | Transplant outdoors | Apr 13 – Aug 2 |
| Peppers | Start seeds indoors | Feb 25 – Mar 28 |
| Peppers | Transplant outdoors | Apr 27 – May 28 |
| Eggplant | Start seeds indoors | Mar 14 – Apr 12 |
| Eggplant | Transplant outdoors | Apr 27 – May 28 |
| Cucumbers | Sow outdoors | Apr 27 – Aug 12 |
| Summer squash | Sow outdoors | Apr 13 – May 28 |
| Winter squash & pumpkins | Sow outdoors | Apr 27 – May 28 |
| Snap beans | Sow outdoors | Apr 13 – Sep 4 |
| Sweet corn | Sow outdoors | Apr 13 – Aug 2 |
| Watermelon & cantaloupe | Sow outdoors | Apr 27 – May 28 |
| Okra | Sow outdoors | Apr 20 – May 13 |
| Peas | Sow outdoors (spring) | Feb 25 – Apr 12 |
| Potatoes | Plant outdoors (spring) | Feb 25 – Apr 27 |
| Onions | Start seeds indoors (spring) | Jan 14 – Feb 10 |
| Onions | Transplant outdoors (spring) | Mar 14 – Apr 12 |
| Broccoli | Start seeds indoors (spring) | Feb 7 – Mar 13 |
| Broccoli | Transplant outdoors (spring) | Mar 14 – Apr 12 |
| Broccoli | Start seeds indoors (fall) | Jul 23 – Aug 2 |
| Broccoli | Transplant outdoors (fall) | Aug 22 – Sep 2 |
| Cabbage | Start seeds indoors (spring) | Jan 28 – Feb 25 |
| Cabbage | Transplant outdoors (spring) | Feb 25 – Mar 28 |
| Cabbage | Start seeds indoors (fall) | Jul 13 – Aug 12 |
| Cabbage | Transplant outdoors (fall) | Aug 12 – Sep 12 |
| Leaf lettuce | Sow outdoors (spring) | Feb 25 – May 13 |
| Leaf lettuce | Sow outdoors (fall) | Aug 12 – Sep 28 |
| Spinach | Sow outdoors (spring) | Feb 18 – Apr 3 |
| Spinach | Sow outdoors (fall) | Aug 29 – Oct 3 |
| Radishes | Sow outdoors (spring) | Feb 25 – Apr 17 |
| Radishes | Sow outdoors (fall) | Aug 12 – Oct 13 |
| Kale | Sow outdoors (spring) | Mar 14 – Apr 3 |
| Kale | Sow outdoors (fall) | Aug 5 – Sep 12 |
| Carrots | Sow outdoors (spring) | Mar 28 – May 13 |
| Carrots | Sow outdoors (fall) | Jul 13 – Aug 28 |
| Garlic | Plant outdoors (fall) | Nov 12 – Dec 13 |
Where these dates come from
ZIP code 97439 is matched to the NOAA station Honeyman Sp, OR, 6.7 km away, at 115 ft elevation (59 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Honeyman Sp, OR (used) | 115 ft | Mar 28 | Nov 22 |
| Florence #2, OR | 75 ft | Apr 10 | Nov 15 |
| Mapleton, OR | 17 ft | Feb 15 | Dec 9 |
| Winchester Bay Coast Grd, OR | 8 ft | Mar 25 | Nov 24 |
Frost dates near Florence
- Westlake, OR 97493 · last Mar 28, first Nov 22
- Mapleton, OR 97453 · last Feb 15, first Dec 9
- Swisshome, OR 97480 · last Apr 18, first Oct 25
- Gardiner, OR 97441 · last Mar 25, first Nov 24
- Reedsport, OR 97467 · last Mar 25, first Nov 24
- Yachats, OR 97498 · last Feb 19, first Dec 11
- Deadwood, OR 97430 · last Apr 18, first Oct 25
- Walton, OR 97490 · last Apr 18, first Oct 25
Frequently asked questions
- When is the last frost in Florence, OR?
- For ZIP code 97439, the average last spring frost (32°F) is March 28, based on NOAA 1991-2020 climate normals for the Honeyman Sp, OR weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Florence, OR?
- The average first fall frost (32°F) is November 22. There is a 1-in-10 chance of frost by October 28, so tender plants are at risk from that point on.
- How long is the growing season in 97439?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 237 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.