City	Sow outdoors	Last frost
Houston	Feb 15 to Mar 8	Feb 2
San Antonio	Feb 25 to Mar 18	Feb 25
Dallas	Mar 2 to Mar 23	Mar 2
Fort Worth	Mar 5 to Mar 26	Mar 5
Austin	Feb 20 to Mar 13	Feb 20
El Paso	Mar 2 to Mar 23	Mar 2
Arlington	Mar 9 to Mar 30	Mar 9
Corpus Christi	Feb 15 to Mar 8	Jan 22
Plano	Mar 7 to Mar 28	Mar 7
Lubbock	Mar 24 to Apr 14	Mar 24
Laredo	Feb 15 to Mar 8	Jan 25
Irving	Mar 8 to Mar 29	Mar 8
Garland	Mar 7 to Mar 28	Mar 7
Frisco	Mar 7 to Mar 28	Mar 7
McKinney	Mar 17 to Apr 7	Mar 17
Grand Prairie	Mar 20 to Apr 10	Mar 20
Amarillo	Apr 15 to May 6	Apr 15
Brownsville	Feb 15 to Mar 8	Jan 9
Denton	Mar 13 to Apr 3	Mar 13
Killeen	Mar 14 to Apr 4	Mar 14
Mesquite	Mar 12 to Apr 2	Mar 12
McAllen	Feb 15 to Mar 8	Jan 9
Pasadena	Feb 15 to Mar 8	Jan 30
Waco	Mar 9 to Mar 30	Mar 9
Midland	Mar 26 to Apr 16	Mar 26
Round Rock	Mar 11 to Apr 1	Mar 11
Lewisville	Mar 14 to Apr 4	Mar 14
Carrollton	Mar 7 to Mar 28	Mar 7
Abilene	Mar 20 to Apr 10	Mar 20
Pearland	Feb 15 to Mar 8	Jan 31
College Station	Feb 27 to Mar 20	Feb 27
Odessa	Mar 15 to Apr 5	Mar 15
New Braunfels	Mar 8 to Mar 29	Mar 8
League City	Feb 15 to Mar 8	Jan 31
Conroe	Feb 24 to Mar 17	Feb 24
Richardson	Mar 7 to Mar 28	Mar 7
The Woodlands	Feb 19 to Mar 12	Feb 19
Tyler	Mar 7 to Mar 28	Mar 7
Allen	Mar 18 to Apr 8	Mar 18
Beaumont	Feb 15 to Mar 8	Feb 14
Edinburg	Feb 15 to Mar 8	Jan 8
Sugar Land	Feb 15 to Mar 8	Feb 9
Georgetown	Mar 6 to Mar 27	Mar 6
Wichita Falls	Mar 26 to Apr 16	Mar 26
San Angelo	Mar 20 to Apr 10	Mar 20
Temple	Mar 14 to Apr 4	Mar 14
Atascocita	Feb 15 to Mar 8	Feb 13
Bryan	Feb 27 to Mar 20	Feb 27
Leander	Mar 6 to Mar 27	Mar 6
Mission	Feb 15 to Mar 8	Jan 9
Baytown	Feb 20 to Mar 13	Feb 20
Mansfield	Mar 9 to Mar 30	Mar 9
Longview	Mar 7 to Mar 28	Mar 7
Pharr	Feb 15 to Mar 8	Jan 9
Flower Mound	Mar 14 to Apr 4	Mar 14
Cedar Park	Mar 11 to Apr 1	Mar 11
San Marcos	Feb 28 to Mar 21	Feb 28
Missouri City	Feb 15 to Mar 8	Feb 15
Harlingen	Feb 15 to Mar 8	Jan 9
North Richland Hills	Mar 10 to Mar 31	Mar 10
Kyle	Feb 28 to Mar 21	Feb 28
Pflugerville	Mar 11 to Apr 1	Mar 11
Rowlett	Mar 10 to Mar 31	Mar 10
Spring	Feb 15 to Mar 8	Feb 13
Victoria	Feb 15 to Mar 8	Feb 14
Fulshear	Feb 15 to Mar 8	Feb 9
Celina	Mar 24 to Apr 14	Mar 24
Wylie	Mar 10 to Mar 31	Mar 10
Little Elm	Mar 13 to Apr 3	Mar 13
Euless	Mar 8 to Mar 29	Mar 8
Texas City	Feb 15 to Mar 8	Jan 25
Burleson	Mar 21 to Apr 11	Mar 21
DeSoto	Mar 6 to Mar 27	Mar 6
Port Arthur	Feb 15 to Mar 8	Feb 14
Rockwall	Mar 10 to Mar 31	Mar 10
Galveston	Feb 15 to Mar 8	Jan 18
Sherman	Mar 14 to Apr 4	Mar 14
Grapevine	Mar 14 to Apr 4	Mar 14
Waxahachie	Mar 16 to Apr 6	Mar 16
Cedar Hill	Mar 20 to Apr 10	Mar 20
Huntsville	Mar 1 to Mar 22	Mar 1
Bedford	Mar 9 to Mar 30	Mar 9
Midlothian	Mar 16 to Apr 6	Mar 16
The Colony	Mar 7 to Mar 28	Mar 7
Keller	Mar 12 to Apr 2	Mar 12
Hutto	Mar 8 to Mar 29	Mar 8
Schertz	Feb 21 to Mar 14	Feb 21
Prosper	Mar 17 to Apr 7	Mar 17
Haltom City	Mar 10 to Mar 31	Mar 10
Weslaco	Feb 15 to Mar 8	Jan 8
Channelview	Feb 15 to Mar 8	Feb 2
Princeton	Mar 18 to Apr 8	Mar 18
Rosenberg	Feb 15 to Mar 8	Feb 9
Forney	Mar 11 to Apr 1	Mar 11
Coppell	Mar 14 to Apr 4	Mar 14
Friendswood	Feb 15 to Mar 8	Jan 31
Seguin	Mar 1 to Mar 22	Mar 1
Weatherford	Mar 25 to Apr 15	Mar 25
Lancaster	Mar 12 to Apr 2	Mar 12
Copperas Cove	Mar 14 to Apr 4	Mar 14
Cleburne	Mar 17 to Apr 7	Mar 17
Cibolo	Feb 21 to Mar 14	Feb 21
Hurst	Mar 10 to Mar 31	Mar 10
Duncanville	Mar 20 to Apr 10	Mar 20
Socorro	Mar 2 to Mar 23	Mar 2
Farmers Branch	Mar 2 to Mar 23	Mar 2
La Porte	Feb 15 to Mar 8	Jan 31
San Juan	Feb 15 to Mar 8	Jan 9
Mission Bend	Feb 15 to Mar 8	Feb 2
Greenville	Mar 18 to Apr 8	Mar 18
Texarkana	Mar 15 to Apr 5	Mar 15
Anna	Mar 17 to Apr 7	Mar 17
Harker Heights	Mar 14 to Apr 4	Mar 14
Timberwood Park	Feb 26 to Mar 19	Feb 26
Del Rio	Feb 16 to Mar 9	Feb 16
Lufkin	Mar 11 to Apr 1	Mar 11
Deer Park	Feb 15 to Mar 8	Feb 2
Canyon Lake	Mar 1 to Mar 22	Mar 1
Sachse	Mar 10 to Mar 31	Mar 10
Nacogdoches	Mar 13 to Apr 3	Mar 13
Converse	Feb 21 to Mar 14	Feb 21
West Odessa	Mar 15 to Apr 5	Mar 15
Southlake	Mar 14 to Apr 4	Mar 14
Alvin	Feb 15 to Mar 8	Feb 14
Melissa	Mar 17 to Apr 7	Mar 17
Fate	Mar 10 to Mar 31	Mar 10
Eagle Pass	Feb 19 to Mar 12	Feb 19
Katy	Feb 15 to Mar 8	Feb 2
Royse City	Mar 10 to Mar 31	Mar 10
Lake Jackson	Feb 15 to Mar 8	Feb 13
Balch Springs	Mar 12 to Apr 2	Mar 12
Denison	Mar 14 to Apr 4	Mar 14
Saginaw	Mar 11 to Apr 1	Mar 11
Belton	Mar 14 to Apr 4	Mar 14
Colleyville	Mar 14 to Apr 4	Mar 14
Ennis	Mar 8 to Mar 29	Mar 8
Kerrville	Mar 27 to Apr 17	Mar 27
Corsicana	Mar 14 to Apr 4	Mar 14
University Park	Mar 2 to Mar 23	Mar 2
Corinth	Mar 13 to Apr 3	Mar 13
Paris	Mar 14 to Apr 4	Mar 14
Horizon City	Mar 2 to Mar 23	Mar 2
Sienna	Feb 15 to Mar 8	Feb 15
San Benito	Feb 15 to Mar 8	Jan 9
Pecan Grove	Feb 15 to Mar 8	Feb 9
Kingsville	Feb 15 to Mar 8	Jan 25
Cloverleaf	Feb 15 to Mar 8	Feb 2
Marshall	Mar 20 to Apr 10	Mar 20
Benbrook	Mar 14 to Apr 4	Mar 14
Alton	Feb 15 to Mar 8	Jan 23
Fresno	Feb 15 to Mar 8	Feb 15
Boerne	Mar 15 to Apr 5	Mar 15
Terrell	Mar 11 to Apr 1	Mar 11
Manor	Mar 4 to Mar 25	Mar 4
Watauga	Mar 10 to Mar 31	Mar 10
Big Spring	Mar 20 to Apr 10	Mar 20
Dickinson	Feb 15 to Mar 8	Jan 31
Stephenville	Mar 29 to Apr 19	Mar 29
Angleton	Feb 15 to Mar 8	Jan 29
Seagoville	Mar 12 to Apr 2	Mar 12
Murphy	Mar 10 to Mar 31	Mar 10
Crowley	Mar 21 to Apr 11	Mar 21
Brushy Creek	Mar 11 to Apr 1	Mar 11
Portland	Feb 15 to Mar 8	Jan 31
Manvel	Feb 15 to Mar 8	Jan 31
Alamo	Feb 15 to Mar 8	Jan 9
Iowa Colony	Feb 15 to Mar 8	Jan 31
Universal City	Feb 21 to Mar 14	Feb 21
Red Oak	Mar 16 to Apr 6	Mar 16
Glenn Heights	Mar 16 to Apr 6	Mar 16
La Marque	Feb 15 to Mar 8	Jan 31

Questions

When should I plant sunflowers in Texas?

In Houston, sow outdoors from February 15 to March 8. Across Texas the window opens between February 15 and April 15, depending on the local last frost.

How is this date worked out?

Sow outdoors up to 3 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.