When is the last frost in Houston, TX?

The average last spring frost (50% probability of 32°F) in Houston is around February 2, based on NOAA/NCEI 1991–2020 normals at the Houston-port, TX station (5.2 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 Houston?

The average first fall frost in Houston, TX is around December 25, giving roughly a 327-day frost-free growing season.

What planting zone is Houston, TX?

Houston is in USDA plant hardiness zone 9b (average annual extreme minimum temperature 25 to 30°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Houston?

In Houston, TX the warmest month is August (avg high 94.3°F) and the coldest is January (avg low 44.3°F). It averages about 54.1″ of precipitation a year.

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Houston, TX Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 77002 · elevation 6′ · NOAA & USDA data

Houston is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 327 days between the average last spring frost (February 2) and first fall frost (December 25). The warmest month is August (avg high 94.3°F); the coldest is January (avg low 44.3°F). It averages 54.1″ of precipitation a year. 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 25 to 30°F

Last spring frost

February 2

avg (50% prob, 32°F)

First fall frost

December 25

avg (50% prob, 32°F)

Growing season

327 days

frost-free window

Warmest month

August

avg high 94.3°F

Month-by-month typical weather in Houston

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Houston-port, TX (5.2 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	62.8	44.3	53.6	4
February	66.7	48.9	57.8	2.8
March	73.3	53.7	63.5	3.8
April	79.2	60.9	70.1	5.2
May	85.7	68.7	77.2	5.1
June	91.3	74.8	83.1	7.9
July	93.2	76.8	85	4.5
August	94.3	76.8	85.6	3.4
September	89.8	71.8	80.8	4.5
October	81.9	62.7	72.3	5.4
November	72	52.9	62.4	3.4
December	65.2	46	55.6	4.3

What to plant when in Houston

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 22 · Transplant out: February 9
Peppers	warm	Start seeds indoors: December 8 · Transplant out: February 16
Cucumbers	warm	Direct sow: February 9
Zucchini / squash	warm	Direct sow: February 9
Bush beans	warm	Direct sow: February 9
Sweet corn	warm	Direct sow: February 9
Basil	warm	Transplant out: February 9
Peas	cool	Sow (spring): December 29 · Sow (fall): October 30
Spinach	cool	Sow (spring): December 22 · Sow (fall): October 30
Lettuce	cool	Sow (spring): January 5 · Sow (fall): October 30
Kale	cool	Transplant (spring): January 12 · Sow (fall): October 16
Broccoli	cool	Transplant (spring): January 19
Carrots	cool	Sow (spring): January 12 · Sow (fall): October 16
Onions	cool	Transplant (spring): January 5
Potatoes	cool	Plant seed potatoes: January 19
Radishes	cool	Sow (spring): January 5 · Sow (fall): November 13

Dates are computed from Houston'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.

Nearby cities in Texas

Pasadena, TX Pearland, TX Sugar Land, TX Missouri City, TX Friendswood, TX Baytown, TX League City, TX Texas City, TX

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 — Houston-port, TX, 5.2 mi (confidence: high). Monthly weather normals: Houston-port, TX, 5.2 mi (confidence: high). 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.