When is the last frost in Killeen, TX?

The average last spring frost (50% probability of 32°F) in Killeen is around March 14, based on NOAA/NCEI 1991–2020 normals at the Killeen, TX station (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 Killeen?

The average first fall frost in Killeen, TX is around November 17, giving roughly a 247-day frost-free growing season.

What planting zone is Killeen, TX?

Killeen 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 Killeen?

In Killeen, TX the warmest month is August (avg high 96.6°F) and the coldest is January (avg low 36.1°F). It averages about 34.8″ of precipitation a year.

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Killeen, TX Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 76541 · elevation 248′ · NOAA & USDA data

Killeen is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 247 days between the average last spring frost (March 14) and first fall frost (November 17). The warmest month is August (avg high 96.6°F); the coldest is January (avg low 36.1°F). It averages 34.8″ 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 15 to 20°F

Last spring frost

March 14

avg (50% prob, 32°F)

First fall frost

November 17

avg (50% prob, 32°F)

Growing season

247 days

frost-free window

Warmest month

August

avg high 96.6°F

Month-by-month typical weather in Killeen

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Killeen, TX (4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	59.5	36.1	47.8	2.5
February	63.1	39.9	51.5	2.2
March	69.8	47.1	58.5	3.3
April	77	53.6	65.3	2.2
May	83.8	63	73.4	4.7
June	92.2	69.7	81	3.2
July	95.7	72.3	84	2.7
August	96.6	72.7	84.6	1.6
September	89.6	66.7	78.2	3.9
October	79.7	56.4	68	3.4
November	69.4	45.8	57.6	2.7
December	60.4	38.1	49.3	2.4

What to plant when in Killeen

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 31 · Transplant out: March 21
Peppers	warm	Start seeds indoors: January 17 · Transplant out: March 28
Cucumbers	warm	Direct sow: March 21
Zucchini / squash	warm	Direct sow: March 21
Bush beans	warm	Direct sow: March 21
Sweet corn	warm	Direct sow: March 21
Basil	warm	Transplant out: March 21
Peas	cool	Sow (spring): February 7 · Sow (fall): September 22
Spinach	cool	Sow (spring): January 31 · Sow (fall): September 22
Lettuce	cool	Sow (spring): February 14 · Sow (fall): September 22
Kale	cool	Transplant (spring): February 21 · Sow (fall): September 8
Broccoli	cool	Transplant (spring): February 28
Carrots	cool	Sow (spring): February 21 · Sow (fall): September 8
Onions	cool	Transplant (spring): February 14
Potatoes	cool	Plant seed potatoes: February 28
Radishes	cool	Sow (spring): February 14 · Sow (fall): October 6

Dates are computed from Killeen'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 — Killeen, TX, 4 mi (confidence: high). Monthly weather normals: Killeen, TX, 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.