Troy, OH planting zone & frost dates

Troy is in USDA hardiness zone 6a. The last spring frost usually comes around April 18 and the first fall frost around October 23, for a growing season of about 186 days.

USDA hardiness zone6aavg. extreme winter low -10°F to -5°F

Average last spring frostApril 1890% chance of no frost after May 5

Average first fall frostOctober 2310% chance of frost by October 9

Growing season186 daysfrost-free days in an average year

Planting calendar for Troy

Dates are counted from the average last spring frost (April 18) 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 21 – Mar 7 Transplant outdoors: Apr 25 – May 2
Peppers	Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9
Eggplant	Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9
Broccoli	Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4
Cabbage	Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4
Onions (sets)	Plant outdoors: Mar 21 – Apr 4
Peas	Sow outdoors: Mar 7 – Mar 21
Spinach	Sow outdoors: Mar 7 – Mar 21
Lettuce	Sow outdoors: Mar 21 – Apr 4
Carrots	Sow outdoors: Mar 21 – Apr 4
Potatoes	Plant outdoors: Mar 21 – Apr 4
Beans	Sow outdoors: Apr 25 – May 2
Sweet corn	Sow outdoors: Apr 25 – May 2
Cucumbers	Sow outdoors: Apr 25 – May 2
Squash & zucchini	Sow outdoors: Apr 25 – May 2
Basil	Start seeds indoors: Mar 7 – Mar 21 Transplant outdoors: Apr 25 – May 2

Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 28 (8 weeks before the average first fall frost on Oct 23).

Frost risk in detail

	90% chance	50% chance	10% chance
Last 32°F frost in spring is after	Apr 5	Apr 18	May 5
First 32°F frost in fall is before	Nov 4	Oct 23	Oct 9

How to read it: in spring there is a 10% chance of a frost after May 5, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 9. A hard freeze (28°F) usually ends around April 5.

Hardiness zone by ZIP code in Troy

45373 zone 6a
45374 zone 6a

Nearby cities

Piqua zone 6a, last frost Apr 18
Vandalia zone 6b, last frost Apr 16
Englewood zone 6a, last frost Apr 16
Huber Heights zone 6b, last frost Apr 16
Shiloh zone 6b, last frost Apr 18
Clayton zone 6a, last frost Apr 16
Sidney zone 6a, last frost Apr 27
Trotwood zone 6b, last frost Apr 18

All cities in Ohio → · Other zone 6a cities →

Questions

What growing zone is Troy, OH?

Troy is in USDA Plant Hardiness Zone 6a (average extreme winter low -10°F to -5°F), according to the USDA 2023 map.

When is the last frost in Troy?

The average last spring frost (32°F) in Troy is April 18. There is still a 10% chance of frost until May 5.

When can I plant tomatoes in Troy?

Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 25 – May 2. Start seeds indoors 6–8 weeks before the last frost.

Frost dates: NOAA U.S. Climate Normals 1991–2020, station Piqua Wwtp, OH (USC00336650), 10.5 km (6.5 mi) from the city center, elevation 260 m, based on 15 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.