When is the last frost in Conroe, TX?

The average last spring frost (50% probability of 32°F) in Conroe is around February 24, based on NOAA/NCEI 1991–2020 normals at the Conroe, TX station (3.4 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 Conroe?

The average first fall frost in Conroe, TX is around December 2, giving roughly a 285-day frost-free growing season.

What planting zone is Conroe, TX?

Conroe is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Conroe?

In Conroe, TX the warmest month is August (avg high 95.8°F) and the coldest is January (avg low 41.9°F). It averages about 51″ of precipitation a year.

Home › Texas › Conroe

Conroe, TX Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 77301 · elevation 75′ · NOAA & USDA data

Conroe is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 285 days between the average last spring frost (February 24) and first fall frost (December 2). The warmest month is August (avg high 95.8°F); the coldest is January (avg low 41.9°F). It averages 51″ 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 20 to 25°F

Last spring frost

February 24

avg (50% prob, 32°F)

First fall frost

December 2

avg (50% prob, 32°F)

Growing season

285 days

frost-free window

Warmest month

August

avg high 95.8°F

Month-by-month typical weather in Conroe

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Conroe, TX (3.4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	62.7	41.9	52.3	4.4	–
February	66.7	45.9	56.3	3.3	–
March	73.5	52.1	62.8	3.5	–
April	79.7	58.9	69.3	3.4	–
May	86.5	66.7	76.6	5.5	–
June	92.3	72.6	82.4	5.2	–
July	94.9	74.4	84.7	3.3	–
August	95.8	74.4	85.1	4.5	–
September	90.4	70	80.2	3.7	–
October	82.1	60.4	71.2	5.4	–
November	71.8	50.7	61.2	4.8	–
December	64.1	43.7	53.9	4.1	–

What to plant when in Conroe

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 13 · Transplant out: March 3
Peppers	warm	Start seeds indoors: December 30 · Transplant out: March 10
Cucumbers	warm	Direct sow: March 3
Zucchini / squash	warm	Direct sow: March 3
Bush beans	warm	Direct sow: March 3
Sweet corn	warm	Direct sow: March 3
Basil	warm	Transplant out: March 3
Peas	cool	Sow (spring): January 20 · Sow (fall): October 7
Spinach	cool	Sow (spring): January 13 · Sow (fall): October 7
Lettuce	cool	Sow (spring): January 27 · Sow (fall): October 7
Kale	cool	Transplant (spring): February 3 · Sow (fall): September 23
Broccoli	cool	Transplant (spring): February 10
Carrots	cool	Sow (spring): February 3 · Sow (fall): September 23
Onions	cool	Transplant (spring): January 27
Potatoes	cool	Plant seed potatoes: February 10
Radishes	cool	Sow (spring): January 27 · Sow (fall): October 21

Dates are computed from Conroe'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

Huntsville, TX Houston, TX Pasadena, TX Baytown, TX Sugar Land, TX Pearland, TX Missouri City, TX Friendswood, 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 — Conroe, TX, 3.4 mi (confidence: high). Monthly weather normals: Conroe, TX, 3.4 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.