When to plant tomatoes in San Antonio: 17 February – 15 August

In San Antonio, tomato: sow for seedlings from 6 December to 24 June; plant into a greenhouse from 27 January to 15 August; plant out into open ground from 17 February to 15 August. For plants and seeds, the places nearby include San Antonio Garden Center (garden centre, 5 km) and Walmart Garden Center (garden centre, 8 km); addresses and opening hours are below.

Tomato in San Antonio: soil, season and weather

In San Antonio frost, not soil, sets the date: the top 7 cm of soil warms to 15 °C — the minimum on the tomato card — around 5 February, 5 days before the last frost on 10 February, so planting waits only for the week after that frost.

Last spring frost	10 February
Top 7 cm of soil at 15 °C	5 February, 5 days before the last frost
Into an unheated greenhouse	27 January – 15 August; January outside: 6.8 °C at night, 17.6 °C by day; card 16–27 °C
First autumn frost	5 December, 291 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	28 April – 24 October
Days left for picking	221
Daylight	10:16 on 27 December, 11:12 on 17 February
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 8 rainy days

Tomato in San Antonio: care after planting

Planted on 17 February: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

17 February — feed: balanced (NPK)
17 March — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in San Antonio during the tomato season

Days average above the tomato card's 16–27 °C in April–October (27.8–35.5 °C). Nights average below 16 °C in February, March and November, December (8.8–13.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
February	20.4	8.8	59	8	11:09
March	25.2	13.5	65	11	11:58
April	27.8	16.3	94	12	12:52
May	30.7	20.1	167	16	13:37
June	34	23.2	80	12	14:01
July	35.1	24.3	85	8	13:52
August	35.5	24.7	88	9	13:13
September	32.4	22.4	107	9	12:22
October	28.5	17.7	80	8	11:30
November	22.4	12.5	67	9	10:42
December	19.3	9.3	57	8	10:16

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around San Antonio, Reynosa is 19 days earlier and Fort Worth 12 days later.

City	Distance	Date	Difference
Austin	119 km	26 February – 23 August	9 days later
Corpus Christi	215 km	3 February – 2 September	14 days earlier
Nuevo Laredo	238 km	3 February – 2 September	14 days earlier
Houston	304 km	24 February – 7 August	7 days later
Reynosa	371 km	29 January – 2 September	19 days earlier
Fort Worth	385 km	1 March – 10 August	12 days later

Where to buy tomato plants and seeds near San Antonio

Buy plants ready to set out from 17 February to 15 August (from 27 January to 15 August for an unheated greenhouse); seed for raising your own is sown from 6 December to 24 June. Within 15 km of San Antonio OpenStreetMap lists 3 garden centres, 4 markets and 1 farm shop (collected 20 October 2026).

San Antonio Garden Center — garden centre
North New Braunfels Avenue 3310, 78209 San Antonio · Mon–Fri 09:00–15:00 · 5 km · sanantoniogardencenter.org
Walmart Garden Center — garden centre
Southeast Military Drive 1200, 78214 San Antonio · 8 km · walmart.com
Walmart Garden Center — garden centre
Southeast Military Drive 3302, 78223 San Antonio · 06:00–23:00 · 10 km
Chicho Boys Fruit Market — market
South Laredo Street 1631, 78207 · Sun 10:00–18:00, Mon–Sat 09:00–19:00 · 2 km · chichoboys.com

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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