When is the last frost in Rockwall, TX?

The average last spring frost (50% probability of 32°F) in Rockwall is around March 10, based on NOAA/NCEI 1991–2020 normals at the Lavon Dam, TX station (12.7 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Rockwall?

The average first fall frost in Rockwall, TX is around November 19, giving roughly a 254-day frost-free growing season.

What planting zone is Rockwall, TX?

Rockwall is in USDA plant hardiness zone 8b (average annual extreme minimum temperature 15 to 20°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Rockwall?

In Rockwall, TX the warmest month is August (avg high 93.3°F) and the coldest is January (avg low 34.2°F). It averages about 39.8″ of precipitation a year and 0.2″ of snow.

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Rockwall, TX Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 75032 · elevation 155′ · NOAA & USDA data

Rockwall is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 254 days between the average last spring frost (March 10) and first fall frost (November 19). The warmest month is August (avg high 93.3°F); the coldest is January (avg low 34.2°F). It averages 39.8″ of precipitation a year and 0.2″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 15 to 20°F

Last spring frost

March 10

avg (50% prob, 32°F)

First fall frost

November 19

avg (50% prob, 32°F)

Growing season

254 days

frost-free window

Warmest month

August

avg high 93.3°F

Month-by-month typical weather in Rockwall

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Lavon Dam, TX (12.7 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	53.7	34.2	44	2.6	0
February	58.2	38.1	48.2	2.7	0
March	65.1	46.4	55.7	3.5	0
April	73	53.4	63.2	3.7	0
May	80.2	62.6	71.4	4.7	0
June	88.3	70.3	79.3	4.1	0
July	92.4	73.2	82.8	1.9	0
August	93.3	73	83.1	2.2	0
September	86.7	65.9	76.3	3.1	0
October	76.7	54.8	65.8	4.4	0
November	64.7	44.6	54.6	3.4	0
December	56.1	36	46.1	3.5	0.2

What to plant when in Rockwall

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 27 · Transplant out: March 17
Peppers	warm	Start seeds indoors: January 13 · Transplant out: March 24
Cucumbers	warm	Direct sow: March 17
Zucchini / squash	warm	Direct sow: March 17
Bush beans	warm	Direct sow: March 17
Sweet corn	warm	Direct sow: March 17
Basil	warm	Transplant out: March 17
Peas	cool	Sow (spring): February 3 · Sow (fall): September 24
Spinach	cool	Sow (spring): January 27 · Sow (fall): September 24
Lettuce	cool	Sow (spring): February 10 · Sow (fall): September 24
Kale	cool	Transplant (spring): February 17 · Sow (fall): September 10
Broccoli	cool	Transplant (spring): February 24
Carrots	cool	Sow (spring): February 17 · Sow (fall): September 10
Onions	cool	Transplant (spring): February 10
Potatoes	cool	Plant seed potatoes: February 24
Radishes	cool	Sow (spring): February 10 · Sow (fall): October 8

Dates are computed from Rockwall's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

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Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Lavon Dam, TX, 12.7 mi (confidence: medium). Monthly weather normals: Lavon Dam, TX, 12.7 mi (confidence: medium). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.