Frost dates for 44047Jefferson, OH
The average last spring frost in Jefferson is May 2 and the average first fall frost is October 21, giving a typical growing season of about 171 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 2
- Average first fall frost
- Oct 21
- Growing season
- 171 days
Safer after May 20 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 180 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 28 · May 14 · May 30 | Sep 25 · Oct 7 · Oct 24 | 145 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 2 · May 20 | Oct 4 · Oct 21 · Nov 5 | 171 days | 100% |
| Hard freeze (28°F) | Apr 5 · Apr 21 · May 6 | Oct 18 · Nov 3 · Nov 19 | 198 days | 100% |
Planting calendar for Jefferson
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 1 – Jun 7 |
| Tomatoes | Transplant outdoors | May 18 – Jul 1 |
| Peppers | Start seeds indoors | Apr 1 – May 2 |
| Peppers | Transplant outdoors | Jun 1 – Jul 2 |
| Eggplant | Start seeds indoors | Apr 18 – May 17 |
| Eggplant | Transplant outdoors | Jun 1 – Jul 2 |
| Cucumbers | Sow outdoors | Jun 1 – Jul 11 |
| Summer squash | Sow outdoors | May 18 – Jul 2 |
| Winter squash & pumpkins | Sow outdoors | Jun 1 – Jul 2 |
| Snap beans | Sow outdoors | May 18 – Aug 3 |
| Sweet corn | Sow outdoors | May 18 – Jul 1 |
| Watermelon & cantaloupe | Sow outdoors | Jun 1 – Jul 2 |
| Okra | Sow outdoors | May 25 – Jun 17 |
| Peas | Sow outdoors (spring) | Apr 1 – May 17 |
| Potatoes | Plant outdoors (spring) | Apr 1 – Jun 1 |
| Onions | Start seeds indoors (spring) | Feb 18 – Mar 17 |
| Onions | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (spring) | Mar 14 – Apr 17 |
| Broccoli | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (fall) | Jun 21 – Jul 1 |
| Broccoli | Transplant outdoors (fall) | Jul 21 – Aug 1 |
| Cabbage | Start seeds indoors (spring) | Mar 4 – Apr 1 |
| Cabbage | Transplant outdoors (spring) | Apr 1 – May 2 |
| Cabbage | Start seeds indoors (fall) | Jun 11 – Jul 11 |
| Cabbage | Transplant outdoors (fall) | Jul 11 – Aug 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 1 – Jun 17 |
| Leaf lettuce | Sow outdoors (fall) | Jul 11 – Aug 27 |
| Spinach | Sow outdoors (spring) | Mar 25 – May 8 |
| Spinach | Sow outdoors (fall) | Jul 28 – Sep 1 |
| Radishes | Sow outdoors (spring) | Apr 1 – May 22 |
| Radishes | Sow outdoors (fall) | Jul 11 – Sep 11 |
| Kale | Sow outdoors (spring) | Apr 18 – May 8 |
| Kale | Sow outdoors (fall) | Jul 4 – Aug 11 |
| Carrots | Sow outdoors (spring) | May 2 – Jun 17 |
| Carrots | Sow outdoors (fall) | Jun 11 – Jul 27 |
| Garlic | Plant outdoors (fall) | Oct 11 – Nov 11 |
Where these dates come from
ZIP code 44047 is matched to the NOAA station Ashtabula Co Ap, OH, 7 km away, at 924 ft elevation (31 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ashtabula Co Ap, OH (used) | 924 ft | May 2 | Oct 21 |
| Dorset, OH | 980 ft | May 10 | Oct 10 |
| Springboro 3 Wnw, PA | 1,005 ft | May 8 | Oct 16 |
| Linesville 1 S, PA | 1,030 ft | Apr 30 | Oct 23 |
Frost dates near Jefferson
- Austinburg, OH 44010 · last May 2, first Oct 21
- Dorset, OH 44032 · last May 10, first Oct 10
- Rock Creek, OH 44084 · last May 10, first Oct 10
- Ashtabula, OH 44005 · last May 2, first Oct 21
- Pierpont, OH 44082 · last May 2, first Oct 21
- Rome, OH 44085 · last May 10, first Oct 10
- Kingsville, OH 44048 · last May 2, first Oct 21
- Geneva, OH 44041 · last Apr 15, first Nov 9
Frequently asked questions
- When is the last frost in Jefferson, OH?
- For ZIP code 44047, the average last spring frost (32°F) is May 2, based on NOAA 1991-2020 climate normals for the Ashtabula Co Ap, OH weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Jefferson, OH?
- The average first fall frost (32°F) is October 21. 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 44047?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 171 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.