When to plant tomatoes in Oklahoma City: 23 March – 21 July

In Oklahoma City, tomato: sow for seedlings from 9 January to 30 May; plant into a greenhouse from 2 March to 21 July; plant out into open ground from 23 March to 21 July. For plants and seeds, the places nearby include Eckroat Seed Co. (farm supply, 4 km) and Smith Farm and Garden (garden centre, 6 km); addresses and opening hours are below.

Tomato in Oklahoma City: soil, season and weather

In Oklahoma City the soil, not frost, sets the date: the last frost is over around 14 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 23 March, 9 days later.

Last spring frost	14 March
Top 7 cm of soil at 15 °C	23 March, 9 days after the last frost
Into an unheated greenhouse	2 March – 21 July; March outside: 7.2 °C at night, 19.2 °C by day; card 16–27 °C
First autumn frost	10 November, 232 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	1 June – 29 September
Days left for picking	162
Daylight	10:23 on 30 January, 12:13 on 23 March
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 5 rainy days

Tomato in Oklahoma City: care after planting

Planted on 23 March: in the first weeks water every 4 days.

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

23 March — feed: balanced (NPK)
20 April — 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 Oklahoma City during the tomato season

Days average above the tomato card's 16–27 °C in June–September (30.1–34.2 °C). Nights average below 16 °C in March, April and October, November (6.7–13.2 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
March	19.2	7.2	70	8	11:55
April	22.6	10.7	123	10	13:04
May	26.6	16.2	119	12	14:01
June	31.7	21.4	93	9	14:32
July	34.2	23.8	68	9	14:20
August	33.4	23.2	70	8	13:31
September	30.1	19.8	87	7	12:26
October	23.9	13.2	85	7	11:20
November	16.8	6.7	50	5	10:19

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Oklahoma City, Dallas is 23 days earlier and Wichita 21 days later.

City	Distance	Date	Difference
Lawton	126 km	13 March – 22 July	10 days earlier
Tulsa	157 km	6 April – 28 July	14 days later
Wichita	247 km	13 April – 10 July	21 days later
Fort Smith	285 km	5 April – 29 July	13 days later
Fort Worth	305 km	1 March – 10 August	22 days earlier
Dallas	306 km	28 February – 15 August	23 days earlier

Where to buy tomato plants and seeds near Oklahoma City

Buy plants ready to set out from 23 March to 21 July (from 2 March to 21 July for an unheated greenhouse); seed for raising your own is sown from 9 January to 30 May. Within 15 km of Oklahoma City OpenStreetMap lists 3 garden centres, 2 farm-supply shops and 4 markets (collected 20 October 2026).

Smith Farm and Garden — garden centre
3733 NW 10th Street, 73107 Oklahoma City · Mon–Fri 08:30–17:30; Sat 09:00–13:00; Sun, public holidays closed · 6 km · smithfarmandgarden.com
Walmart Garden Center — garden centre
East Interstate 240 Service Road 100, 73149 Oklahoma City · 9 km · walmart.com
Eckroat Seed Co. — farm supply
North Martin Luther King Avenue 1106, 73117 · Mon–Fri 08:00–17:30; Sat 08:00–12:00 · 4 km · eckroatseed.com
Green Acre Sod Store — farm supply
North Bryant Avenue 7604, 73131 Oklahoma City · 10 km

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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