Frost dates for 45321Eldorado, OH
The average last spring frost in Eldorado is April 24 and the average first fall frost is October 20, giving a typical growing season of about 180 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 24
- Average first fall frost
- Oct 20
- Growing season
- 180 days
Safer after May 10 (1-in-10 risk)
Possible by Oct 7 (1-in-10 risk)
Last frost typically in 174 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 19 · May 3 · May 19 | Sep 26 · Oct 10 · Oct 22 | 160 days | 100% |
| Frost / freeze (32°F) | Apr 8 · Apr 24 · May 10 | Oct 7 · Oct 20 · Nov 1 | 180 days | 100% |
| Hard freeze (28°F) | Mar 26 · Apr 10 · Apr 28 | Oct 17 · Oct 30 · Nov 12 | 202 days | 100% |
Planting calendar for Eldorado
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 24 – May 30 |
| Tomatoes | Transplant outdoors | May 10 – Jun 30 |
| Peppers | Start seeds indoors | Mar 24 – Apr 24 |
| Peppers | Transplant outdoors | May 24 – Jun 24 |
| Eggplant | Start seeds indoors | Apr 10 – May 9 |
| Eggplant | Transplant outdoors | May 24 – Jun 24 |
| Cucumbers | Sow outdoors | May 24 – Jul 10 |
| Summer squash | Sow outdoors | May 10 – Jun 24 |
| Winter squash & pumpkins | Sow outdoors | May 24 – Jun 24 |
| Snap beans | Sow outdoors | May 10 – Aug 2 |
| Sweet corn | Sow outdoors | May 10 – Jun 30 |
| Watermelon & cantaloupe | Sow outdoors | May 24 – Jun 24 |
| Okra | Sow outdoors | May 17 – Jun 9 |
| Peas | Sow outdoors (spring) | Mar 24 – May 9 |
| Potatoes | Plant outdoors (spring) | Mar 24 – May 24 |
| Onions | Start seeds indoors (spring) | Feb 10 – Mar 9 |
| Onions | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (spring) | Mar 6 – Apr 9 |
| Broccoli | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (fall) | Jun 20 – Jun 30 |
| Broccoli | Transplant outdoors (fall) | Jul 20 – Jul 31 |
| Cabbage | Start seeds indoors (spring) | Feb 24 – Mar 24 |
| Cabbage | Transplant outdoors (spring) | Mar 24 – Apr 24 |
| Cabbage | Start seeds indoors (fall) | Jun 10 – Jul 10 |
| Cabbage | Transplant outdoors (fall) | Jul 10 – Aug 10 |
| Leaf lettuce | Sow outdoors (spring) | Mar 24 – Jun 9 |
| Leaf lettuce | Sow outdoors (fall) | Jul 10 – Aug 26 |
| Spinach | Sow outdoors (spring) | Mar 17 – Apr 30 |
| Spinach | Sow outdoors (fall) | Jul 27 – Aug 31 |
| Radishes | Sow outdoors (spring) | Mar 24 – May 14 |
| Radishes | Sow outdoors (fall) | Jul 10 – Sep 10 |
| Kale | Sow outdoors (spring) | Apr 10 – Apr 30 |
| Kale | Sow outdoors (fall) | Jul 3 – Aug 10 |
| Carrots | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Carrots | Sow outdoors (fall) | Jun 10 – Jul 26 |
| Garlic | Plant outdoors (fall) | Oct 10 – Nov 10 |
Where these dates come from
ZIP code 45321 is matched to the NOAA station Richmond Wtr Wks, IN, 17.4 km away, at 1,005 ft elevation (127 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Richmond Wtr Wks, IN (used) | 1,005 ft | Apr 24 | Oct 20 |
| Eaton, OH | 1,002 ft | Apr 25 | Oct 20 |
| Greenville Wtp, OH | 1,030 ft | Apr 21 | Oct 20 |
| Winchester Airport 3 E, IN | 1,110 ft | Apr 20 | Oct 21 |
Frost dates near Eldorado
- West Manchester, OH 45382 · last Apr 25, first Oct 20
- New Paris, OH 45347 · last Apr 24, first Oct 20
- New Madison, OH 45346 · last Apr 21, first Oct 20
- Lewisburg, OH 45338 · last Apr 25, first Oct 20
- Hollansburg, OH 45332 · last Apr 21, first Oct 20
- Verona, OH 45378 · last Apr 25, first Oct 20
- Eaton, OH 45320 · last Apr 25, first Oct 20
- Arcanum, OH 45304 · last Apr 21, first Oct 20
Frequently asked questions
- When is the last frost in Eldorado, OH?
- For ZIP code 45321, the average last spring frost (32°F) is April 24, based on NOAA 1991-2020 climate normals for the Richmond Wtr Wks, IN weather station. There is a 1-in-10 chance of a frost after May 10.
- When is the first frost in Eldorado, OH?
- The average first fall frost (32°F) is October 20. There is a 1-in-10 chance of frost by October 7, so tender plants are at risk from that point on.
- How long is the growing season in 45321?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 180 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.