Broken Arrow, OK planting zone & frost dates

Broken Arrow is in USDA hardiness zone 7b. The last spring frost usually comes around April 1 and the first fall frost around November 1, for a growing season of about 212 days.

USDA hardiness zone7bavg. extreme winter low 5°F to 10°F

Average last spring frostApril 190% chance of no frost after April 20

Average first fall frostNovember 110% chance of frost by October 16

Growing season212 daysfrost-free days in an average year

Planting calendar for Broken Arrow

Dates are counted from the average last spring frost (April 1) 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 4 – Feb 18 Transplant outdoors: Apr 8 – Apr 15
Peppers	Start seeds indoors: Jan 21 – Feb 4 Transplant outdoors: Apr 15 – Apr 22
Eggplant	Start seeds indoors: Jan 21 – Feb 4 Transplant outdoors: Apr 15 – Apr 22
Broccoli	Start seeds indoors: Jan 21 – Feb 4 Transplant outdoors: Mar 4 – Mar 18
Cabbage	Start seeds indoors: Jan 21 – Feb 4 Transplant outdoors: Mar 4 – Mar 18
Onions (sets)	Plant outdoors: Mar 4 – Mar 18
Peas	Sow outdoors: Feb 18 – Mar 4
Spinach	Sow outdoors: Feb 18 – Mar 4
Lettuce	Sow outdoors: Mar 4 – Mar 18
Carrots	Sow outdoors: Mar 4 – Mar 18
Potatoes	Plant outdoors: Mar 4 – Mar 18
Beans	Sow outdoors: Apr 8 – Apr 15
Sweet corn	Sow outdoors: Apr 8 – Apr 15
Cucumbers	Sow outdoors: Apr 8 – Apr 15
Squash & zucchini	Sow outdoors: Apr 8 – Apr 15
Basil	Start seeds indoors: Feb 18 – Mar 4 Transplant outdoors: Apr 8 – Apr 15

Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 6 (8 weeks before the average first fall frost on Nov 1).

Useful for zone 7b 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

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Frost risk in detail

	90% chance	50% chance	10% chance
Last 32°F frost in spring is after	Mar 12	Apr 1	Apr 20
First 32°F frost in fall is before	Nov 13	Nov 1	Oct 16

How to read it: in spring there is a 10% chance of a frost after April 20, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 16. A hard freeze (28°F) usually ends around March 17.

Hardiness zone by ZIP code in Broken Arrow

74011 zone 7b
74012 zone 7b
74013 zone 7b
74014 zone 7b

Nearby cities

Bixby zone 7b, last frost Apr 1
Jenks zone 7b, last frost Mar 30
Tulsa zone 7b, last frost Mar 31
Owasso zone 7b, last frost Mar 31
Glenpool zone 7b, last frost Mar 30
Claremore zone 7a, last frost Apr 7
Sapulpa zone 7b, last frost Mar 30
Sand Springs zone 7b, last frost Mar 30

All cities in Oklahoma → · Other zone 7b cities →

Questions

What growing zone is Broken Arrow, OK?

Broken Arrow is in USDA Plant Hardiness Zone 7b (average extreme winter low 5°F to 10°F), according to the USDA 2023 map.

When is the last frost in Broken Arrow?

The average last spring frost (32°F) in Broken Arrow is April 1. There is still a 10% chance of frost until April 20.

When can I plant tomatoes in Broken Arrow?

Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 8 – Apr 15. Start seeds indoors 6–8 weeks before the last frost.

Frost dates: NOAA U.S. Climate Normals 1991–2020, station Bixby, OK (USC00340782), 11.3 km (7.0 mi) from the city center, elevation 184 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.