Frost dates for 45439 — Dayton, OH
Last spring frostApr 18median date
First fall frostOct 25median date
Growing season190 daysfrost-free
Hardiness zone6bZone 6b
How Dayton compares
- In 8 years out of 10, the last spring frost in Dayton falls between April 3 and May 5, a 32-day window. The first fall frost falls between October 13 and November 7.
- The median last frost is 6 days earlier than the Ohio median of Apr 24.
- Its 190-day growing season is longer than 82% of the 1,063 Ohio places with a regular frost season (state median 180 days).
- The last frost is 4 days earlier than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 107 nights a year at or below 32°F.
- Compared with Cincinnati, OH, 64 km away, the last frost here is 1 day later than there and the growing season is 2 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 3 |
| 50% (median) | April 18 |
| 10% (safe for tender plants) | May 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 13 |
| 50% (median) | October 25 |
| 90% (late) | November 7 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Dayton, OH
Frost dates for 45439 — Dayton, OH — last frost Apr 18, first frost Oct 25, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 24 to Feb 7Transplant outside: Mar 21 to Apr 4
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 21 to Apr 25Plant for fall: Aug 30 to Sep 27
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 21 to Apr 4Plant for fall: Aug 16 to Sep 6
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 19 to Aug 9
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 19 to Aug 9
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 19 to Aug 9
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 7 to Mar 28Plant for fall: Aug 2 to Aug 23
Sow outdoors: Mar 7 to Mar 28Plant for fall: Aug 30 to Sep 20
Sow outdoors: Mar 14 to Apr 25Plant for fall: Sep 13 to Oct 4
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Aug 9 to Aug 23
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9Plant for fall: Aug 16 to Aug 30
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 2 to Aug 16
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 16 to Aug 30
Sow outdoors: Mar 28 to Apr 18
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 16 to Aug 30
Sow outdoors: Apr 4 to Apr 25Plant for fall: Aug 30 to Sep 20
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 9 to Aug 23
Sow outdoors: Apr 25 to May 9
Transplant outside: May 2 to May 23
Plant for fall: Oct 11 to Nov 15
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Dayton, OH
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 24 – Feb 7 | Mar 21 – Apr 4 | — | — |
| Peppers | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Eggplant | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Tomatoes | Feb 21 – Mar 7 | Apr 25 – May 9 | — | — |
| Lettuce | Feb 21 – Mar 7 | Mar 28 – Apr 11 | Mar 21 – Apr 25 | Aug 30 – Sep 27 |
| Kale | Feb 21 – Mar 7 | Mar 21 – Apr 4 | Mar 21 – Apr 4 | Aug 16 – Sep 6 |
| Broccoli | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 19 – Aug 9 |
| Cabbage | Feb 21 – Mar 7 | Mar 28 – Apr 11 | — | Jul 19 – Aug 9 |
| Cauliflower | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 19 – Aug 9 |
| Okra | Mar 7 – Mar 21 | May 9 – May 23 | May 9 – May 23 | — |
| Basil | Mar 7 – Mar 21 | Apr 25 – May 9 | — | — |
| Peas | — | — | Mar 7 – Mar 28 | Aug 2 – Aug 23 |
| Spinach | — | — | Mar 7 – Mar 28 | Aug 30 – Sep 20 |
| Radishes | — | — | Mar 14 – Apr 25 | Sep 13 – Oct 4 |
| Cucumbers | Mar 21 – Mar 28 | May 2 – May 9 | Apr 25 – May 9 | Aug 9 – Aug 23 |
| Zucchini & Summer Squash | Mar 21 – Mar 28 | — | Apr 25 – May 9 | Aug 16 – Aug 30 |
| Winter Squash & Pumpkins | Mar 21 – Mar 28 | — | Apr 25 – May 9 | — |
| Melons & Watermelon | Mar 21 – Mar 28 | May 2 – May 16 | — | — |
| Carrots | — | — | Mar 28 – Apr 25 | Aug 2 – Aug 16 |
| Beets | — | — | Mar 28 – Apr 25 | Aug 16 – Aug 30 |
| Potatoes | — | — | Mar 28 – Apr 18 | — |
| Swiss Chard | — | — | Apr 4 – May 2 | Aug 16 – Aug 30 |
| Cilantro | — | — | Apr 4 – Apr 25 | Aug 30 – Sep 20 |
| Green Beans | — | — | Apr 25 – May 16 | Aug 9 – Aug 23 |
| Sweet Corn | — | — | Apr 25 – May 9 | — |
| Sweet Potatoes | — | May 2 – May 23 | — | — |
| Garlic | — | — | — | Oct 11 – Nov 15 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Dayton Mcd, OH weather station, 7 km away (elevation 722 ft (220 m)).
ZIP codes in Dayton: 45401 45402 45403 45404 45405 45406 45409 45410 45412 45413 45414 45415 45416 45417 45419 45420 45422 45423 45424 45426 45428 45429 45430 45431 45432 45433 45434 45435 45437 45439 45440 45441 45448 45449 45458 45459 45469 45470 45475 45479 45481 45482 45490
Frost dates near Dayton
- Miamisburg Apr 18 · Oct 25
- Bellbrook Apr 17 · Oct 26
- Springboro Apr 17 · Oct 26
- New Lebanon Apr 18 · Oct 25
- Germantown Apr 24 · Oct 19
- Alpha Apr 18 · Oct 25
- Farmersville Apr 24 · Oct 19
- Spring Valley Apr 18 · Oct 24
Frequently asked questions
When is the last frost in Dayton, OH?
The median last spring frost in Dayton, OH is April 18. There is still about a 10% chance of frost after May 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Dayton, OH?
The median first fall frost is October 25, with about a 10% chance of frost before October 13.
How long is the growing season in Dayton, OH?
About 190 days between the median last spring frost and first fall frost.
What planting zone is Dayton, OH?
Dayton, OH is in USDA hardiness zone 6b.