Roma, TX planting zone & frost dates

Roma is in USDA hardiness zone 9b. The last spring frost usually comes around January 31 and the first fall frost around December 17, for a growing season of about 321 days.

USDA hardiness zone9bavg. extreme winter low 25°F to 30°F

Average last spring frostJanuary 3190% chance of no frost after March 4

Average first fall frostDecember 1710% chance of frost by November 22

Growing season321 daysfrost-free days in an average year

Planting calendar for Roma

Dates are counted from the average last spring frost (January 31) 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: Dec 6 – Dec 20 Transplant outdoors: Feb 7 – Feb 14
Peppers	Start seeds indoors: Nov 22 – Dec 6 Transplant outdoors: Feb 14 – Feb 21
Eggplant	Start seeds indoors: Nov 22 – Dec 6 Transplant outdoors: Feb 14 – Feb 21
Broccoli	Start seeds indoors: Nov 22 – Dec 6 Transplant outdoors: Jan 3 – Jan 17
Cabbage	Start seeds indoors: Nov 22 – Dec 6 Transplant outdoors: Jan 3 – Jan 17
Onions (sets)	Plant outdoors: Jan 3 – Jan 17
Peas	Sow outdoors: Dec 20 – Jan 3
Spinach	Sow outdoors: Dec 20 – Jan 3
Lettuce	Sow outdoors: Jan 3 – Jan 17
Carrots	Sow outdoors: Jan 3 – Jan 17
Potatoes	Plant outdoors: Jan 3 – Jan 17
Beans	Sow outdoors: Feb 7 – Feb 14
Sweet corn	Sow outdoors: Feb 7 – Feb 14
Cucumbers	Sow outdoors: Feb 7 – Feb 14
Squash & zucchini	Sow outdoors: Feb 7 – Feb 14
Basil	Start seeds indoors: Dec 20 – Jan 3 Transplant outdoors: Feb 7 – Feb 14

Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 22 (8 weeks before the average first fall frost on Dec 17).

Frost risk in detail

	90% chance	50% chance	10% chance
Last 32°F frost in spring is after	Dec 29	Jan 31	Mar 4
First 32°F frost in fall is before	Jan 20	Dec 17	Nov 22

How to read it: in spring there is a 10% chance of a frost after March 4, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 22. A hard freeze (28°F) usually ends around January 12.

Hardiness zone by ZIP code in Roma

78584 zone 9b

Nearby cities

Rio Grande City zone 9b, last frost Jan 31
La Homa zone 10a, last frost Jan 23
Alton zone 10a, last frost Jan 23
Mission zone 10a
McAllen zone 10a
Hidalgo zone 10a
Pharr zone 10a
Edinburg zone 10a

All cities in Texas → · Other zone 9b cities →

Questions

What growing zone is Roma, TX?

Roma is in USDA Plant Hardiness Zone 9b (average extreme winter low 25°F to 30°F), according to the USDA 2023 map.

When is the last frost in Roma?

The average last spring frost (32°F) in Roma is January 31. There is still a 10% chance of frost until March 4.

When can I plant tomatoes in Roma?

Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Feb 7 – Feb 14. Start seeds indoors 6–8 weeks before the last frost.

Frost dates: NOAA U.S. Climate Normals 1991–2020, station Rio Grande City, TX (USC00417622), 20.6 km (12.8 mi) from the city center, elevation 52 m, based on 27 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.