Frost dates for 97453Mapleton, OR
The average last spring frost in Mapleton is February 15 and the average first fall frost is December 9, giving a typical growing season of about 306 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 15
- Average first fall frost
- Dec 9
- Growing season
- 306 days
Safer after Mar 19 (1-in-10 risk)
Possible by Nov 9 (1-in-10 risk)
First frost typically in 38 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) | Feb 24 · Mar 30 · Apr 29 | Oct 22 · Nov 16 · Dec 11 | 231 days | 100% |
| Frost / freeze (32°F) | Dec 23 · Feb 15 · Mar 19 | Nov 9 · Dec 9 · Jan 24 | 306 days | 93% |
| Hard freeze (28°F) | Dec 9 · Jan 6 · Feb 19 | Dec 1 · Dec 25 · Feb 11 | 365 days | 48% |
Planting calendar for Mapleton
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 | Jan 15 – Mar 23 |
| Tomatoes | Transplant outdoors | Mar 3 – Aug 19 |
| Peppers | Start seeds indoors | Jan 15 – Feb 15 |
| Peppers | Transplant outdoors | Mar 17 – Apr 17 |
| Eggplant | Start seeds indoors | Feb 1 – Mar 2 |
| Eggplant | Transplant outdoors | Mar 17 – Apr 17 |
| Cucumbers | Sow outdoors | Mar 17 – Aug 29 |
| Summer squash | Sow outdoors | Mar 3 – Apr 17 |
| Winter squash & pumpkins | Sow outdoors | Mar 17 – Apr 17 |
| Snap beans | Sow outdoors | Mar 3 – Sep 21 |
| Sweet corn | Sow outdoors | Mar 3 – Aug 19 |
| Watermelon & cantaloupe | Sow outdoors | Mar 17 – Apr 17 |
| Okra | Sow outdoors | Mar 10 – Apr 2 |
| Peas | Sow outdoors (spring) | Jan 15 – Mar 2 |
| Potatoes | Plant outdoors (spring) | Jan 15 – Mar 17 |
| Onions | Start seeds indoors (spring) | Dec 4 – Dec 31 |
| Onions | Transplant outdoors (spring) | Feb 1 – Mar 2 |
| Broccoli | Start seeds indoors (spring) | Dec 28 – Jan 31 |
| Broccoli | Transplant outdoors (spring) | Feb 1 – Mar 2 |
| Broccoli | Start seeds indoors (fall) | Aug 9 – Aug 19 |
| Broccoli | Transplant outdoors (fall) | Sep 8 – Sep 19 |
| Cabbage | Start seeds indoors (spring) | Dec 18 – Jan 15 |
| Cabbage | Transplant outdoors (spring) | Jan 15 – Feb 15 |
| Cabbage | Start seeds indoors (fall) | Jul 30 – Aug 29 |
| Cabbage | Transplant outdoors (fall) | Aug 29 – Sep 29 |
| Leaf lettuce | Sow outdoors (spring) | Jan 15 – Apr 2 |
| Leaf lettuce | Sow outdoors (fall) | Aug 29 – Oct 15 |
| Spinach | Sow outdoors (spring) | Jan 8 – Feb 21 |
| Spinach | Sow outdoors (fall) | Sep 15 – Oct 20 |
| Radishes | Sow outdoors (spring) | Jan 15 – Mar 7 |
| Radishes | Sow outdoors (fall) | Aug 29 – Oct 30 |
| Kale | Sow outdoors (spring) | Feb 1 – Feb 21 |
| Kale | Sow outdoors (fall) | Aug 22 – Sep 29 |
| Carrots | Sow outdoors (spring) | Feb 15 – Apr 2 |
| Carrots | Sow outdoors (fall) | Jul 30 – Sep 14 |
| Garlic | Plant outdoors (fall) | Nov 29 – Dec 30 |
Where these dates come from
ZIP code 97453 is matched to the NOAA station Mapleton, OR, 0.7 km away, at 17 ft elevation (183 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mapleton, OR (used) | 17 ft | Feb 15 | Dec 9 |
| Florence #2, OR | 75 ft | Apr 10 | Nov 15 |
| Honeyman Sp, OR | 115 ft | Mar 28 | Nov 22 |
| Yachats, OR | 50 ft | Feb 19 | Dec 11 |
Frost dates near Mapleton
- Swisshome, OR 97480 · last Apr 18, first Oct 25
- Westlake, OR 97493 · last Mar 28, first Nov 22
- Florence, OR 97439 · last Mar 28, first Nov 22
- Deadwood, OR 97430 · last Apr 18, first Oct 25
- Walton, OR 97490 · last Apr 18, first Oct 25
- Blachly, OR 97412 · last Apr 18, first Oct 25
- Noti, OR 97461 · last Apr 18, first Oct 25
- Yachats, OR 97498 · last Feb 19, first Dec 11
Frequently asked questions
- When is the last frost in Mapleton, OR?
- For ZIP code 97453, the average last spring frost (32°F) is February 15, based on NOAA 1991-2020 climate normals for the Mapleton, OR weather station. There is a 1-in-10 chance of a frost after March 19.
- When is the first frost in Mapleton, OR?
- The average first fall frost (32°F) is December 9. There is a 1-in-10 chance of frost by November 9, so tender plants are at risk from that point on.
- How long is the growing season in 97453?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 306 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.