Blue Ash, OH planting zone & frost dates
Blue Ash is in USDA hardiness zone 6b. The last spring frost usually comes around April 23 and the first fall frost around October 18, for a growing season of about 177 days.
Planting calendar for Blue Ash
Dates are counted from the average last spring frost (April 23) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Feb 26 – Mar 12 Transplant outdoors: Apr 30 – May 7 |
| Peppers | Start seeds indoors: Feb 12 – Feb 26 Transplant outdoors: May 7 – May 14 |
| Eggplant | Start seeds indoors: Feb 12 – Feb 26 Transplant outdoors: May 7 – May 14 |
| Broccoli | Start seeds indoors: Feb 12 – Feb 26 Transplant outdoors: Mar 26 – Apr 9 |
| Cabbage | Start seeds indoors: Feb 12 – Feb 26 Transplant outdoors: Mar 26 – Apr 9 |
| Onions (sets) | Plant outdoors: Mar 26 – Apr 9 |
| Peas | Sow outdoors: Mar 12 – Mar 26 |
| Spinach | Sow outdoors: Mar 12 – Mar 26 |
| Lettuce | Sow outdoors: Mar 26 – Apr 9 |
| Carrots | Sow outdoors: Mar 26 – Apr 9 |
| Potatoes | Plant outdoors: Mar 26 – Apr 9 |
| Beans | Sow outdoors: Apr 30 – May 7 |
| Sweet corn | Sow outdoors: Apr 30 – May 7 |
| Cucumbers | Sow outdoors: Apr 30 – May 7 |
| Squash & zucchini | Sow outdoors: Apr 30 – May 7 |
| Basil | Start seeds indoors: Mar 12 – Mar 26 Transplant outdoors: Apr 30 – May 7 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 23 (8 weeks before the average first fall frost on Oct 18).
Useful for zone 6b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 9 | Apr 23 | May 8 |
| First 32°F frost in fall is before | Oct 28 | Oct 18 | Oct 6 |
How to read it: in spring there is a 10% chance of a frost after May 8, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 6. A hard freeze (28°F) usually ends around April 11.
Nearby cities
- Montgomery zone 6b, last frost Apr 23
- Sharonville zone 6b, last frost Apr 22
- Reading zone 6b, last frost Apr 16
- Norwood zone 6b, last frost Apr 16
- Loveland zone 6b, last frost Apr 23
- Springdale zone 6b, last frost Apr 22
- Forest Park zone 6b, last frost Apr 22
- Mason zone 6b, last frost Apr 22
Questions
What growing zone is Blue Ash, OH?
Blue Ash is in USDA Plant Hardiness Zone 6b (average extreme winter low -5°F to 0°F), according to the USDA 2023 map.
When is the last frost in Blue Ash?
The average last spring frost (32°F) in Blue Ash is April 23. There is still a 10% chance of frost until May 8.
When can I plant tomatoes in Blue Ash?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 30 – May 7. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Milford, OH (USC00335268), 9.7 km (6.0 mi) from the city center, elevation 158 m, based on 13 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.