When is the last frost in Baytown, TX?

The average last spring frost (50% probability of 32°F) in Baytown is around February 20, based on NOAA/NCEI 1991–2020 normals at the Baytown, TX station (12.3 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 Baytown?

The average first fall frost in Baytown, TX is around December 4, giving roughly a 292-day frost-free growing season.

What planting zone is Baytown, TX?

Baytown 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 Baytown?

In Baytown, TX the warmest month is August (avg high 92.3°F) and the coldest is January (avg low 41.4°F). It averages about 64.7″ of precipitation a year.

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Baytown, TX Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 77520 · elevation 8′ · NOAA & USDA data

Baytown is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 292 days between the average last spring frost (February 20) and first fall frost (December 4). The warmest month is August (avg high 92.3°F); the coldest is January (avg low 41.4°F). It averages 64.7″ 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 20

avg (50% prob, 32°F)

First fall frost

December 4

avg (50% prob, 32°F)

Growing season

292 days

frost-free window

Warmest month

August

avg high 92.3°F

Month-by-month typical weather in Baytown

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Baytown, TX (12.3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	62.9	41.4	52.1	4.9
February	66.4	45.3	55.8	3.8
March	72.1	52	62	3.9
April	77.5	58.5	68	4.5
May	84.2	66.7	75.4	6
June	89.2	72.7	80.9	7.1
July	91.5	74.6	83.1	5.5
August	92.3	74.3	83.3	6.8
September	88.5	69	78.8	6.4
October	81.6	59.6	70.6	6.1
November	71.4	50.1	60.7	4.9
December	64.5	43.6	54.1	4.8

What to plant when in Baytown

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 9 · Transplant out: February 27
Peppers	warm	Start seeds indoors: December 26 · Transplant out: March 6
Cucumbers	warm	Direct sow: February 27
Zucchini / squash	warm	Direct sow: February 27
Bush beans	warm	Direct sow: February 27
Sweet corn	warm	Direct sow: February 27
Basil	warm	Transplant out: February 27
Peas	cool	Sow (spring): January 16 · Sow (fall): October 9
Spinach	cool	Sow (spring): January 9 · Sow (fall): October 9
Lettuce	cool	Sow (spring): January 23 · Sow (fall): October 9
Kale	cool	Transplant (spring): January 30 · Sow (fall): September 25
Broccoli	cool	Transplant (spring): February 6
Carrots	cool	Sow (spring): January 30 · Sow (fall): September 25
Onions	cool	Transplant (spring): January 23
Potatoes	cool	Plant seed potatoes: February 6
Radishes	cool	Sow (spring): January 23 · Sow (fall): October 23

Dates are computed from Baytown'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

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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 — Baytown, TX, 12.3 mi (confidence: medium). Monthly weather normals: Baytown, TX, 12.3 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.