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Last and first frost dates in Oklahoma City

United States

In Oklahoma City the last spring frost usually comes around 14 March and the first autumn frost around 10 November, which leaves about 241 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 23 March to 21 July.

Last spring frostaround 14 March
First autumn frostaround 10 November
Frost-free days241 days
Hardiness zone (USDA-equivalent)official USDA map: 7b

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When is the last frost in Oklahoma City?

The last frost in Oklahoma City usually comes around 14 March: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 21 February, while corn waits until 21 March. The first autumn frost follows around 10 November, about 241 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha19 January – 2 August28 February – 11 September21 March – 11 September
Ageratumfrom 5 January—from 23 March
Arugula——sow 21 February – 6 October
Basil15 February – 8 September25 March – 16 October15 April – 16 October
Beet——sow 21 February – 11 September
Bell Pepper24 January – 22 May25 March – 21 July15 April – 21 July
Black-eyed Susanfrom 28 December—from 21 March
Bok Choy24 January – 19 September28 February – 24 October21 March – 24 October
Borage——sow 21 March – 16 September
Broad bean——sow 21 February – 2 August
Broccoli——sow 21 February – 26 July
Brussels Sprouts17 December – 23 June31 January – 7 August21 February – 7 August
Busy Lizziefrom 27 December—from 21 March
Cabbage——sow 21 February – 3 July
Calendula——sow from 21 February
Carrot——sow 21 February – 18 August
Cauliflower20 December – 26 July31 January – 6 September21 February – 6 September
Celeriac13 December – 23 May28 February – 8 August21 March – 8 August
Celery13 December – 2 June28 February – 18 August21 March – 18 August
Celosiafrom 29 Januaryfrom 15 Marchfrom 5 April
Chamomile——sow 21 February – 6 September
Chayote2 December – 16 May28 February – 12 August21 March – 12 August
Chickpea——sow 21 February – 23 July
Chicory6 January – 17 August—21 February – 11 September
Chili Pepper24 January – 28 June25 March – 27 August15 April – 27 August
China asterfrom 1 Februaryfrom 25 Marchfrom 15 April
Chives——sow 21 February – 28 August
Cilantro——sow 21 February – 7 September
Corn——sow 21 March – 23 July
Corn poppy——sow from 21 February
Cosmosfrom 29 Januaryfrom 15 Marchfrom 5 April
Cucumber25 February – 29 July25 March – 26 August15 April – 26 August
Daikon——sow 21 February – 4 September
Delphiniumfrom 3 December—from 21 February
Dill——sow 21 February – 17 September
Edging lobeliafrom 27 December—from 21 March
Eggplant24 January – 22 May25 March – 21 July15 April – 21 July
Florence fennel14 January – 2 August28 February – 16 September21 March – 16 September
Foxglovefrom 15 November—from 21 February
Garden sorrel——sow 21 February – 5 September
Green Beans——sow 5 April – 31 July
Hollyhock——sow from 21 February
Hyssop——sow 21 February – 29 July
Kale——sow 21 February – 30 August
Kiwano29 January – 5 August2 March – 6 September23 March – 6 September
Kohlrabi——sow 21 February – 9 September
Leek22 November – 14 May31 January – 23 July21 February – 23 July
Lemon balm——sow 21 February – 1 September
Lettuce——sow 21 February – 14 September
Lisianthusfrom 5 Novemberfrom 31 Januaryfrom 21 February
Lovage——sow from 21 February
Luffa11 February – 30 May25 March – 11 July15 April – 11 July
Marigoldfrom 17 Januaryfrom 28 Februaryfrom 21 March
Marjoram24 January – 17 August—15 April – 16 October
Melon25 February – 16 July25 March – 13 August15 April – 13 August
Microgreens——sow 5 April – 27 October
Moringa17 February – 22 August13 April – 16 October4 May – 16 October
Moss rosefrom 3 January—from 21 March
Mustard greens——sow 21 February – 26 September
Napa cabbage26 January – 27 August28 February – 29 September21 March – 29 September
Nasturtiumfrom 21 Januaryfrom 28 Februaryfrom 21 March
Okra11 February – 10 August25 March – 21 September15 April – 21 September
Oregano2 December – 7 August31 January – 6 October21 February – 6 October
Pansyfrom 6 Decemberfrom 31 Januaryfrom 21 February
Parsley——sow 21 February – 26 August
Parsnip——sow 21 February – 15 July
Peanut16 February – 6 July25 March – 12 August15 April – 12 August
Peas——sow 21 February – 28 August
Petuniafrom 21 Januaryfrom 25 Marchfrom 15 April
Physalis16 January – 3 July2 March – 17 August23 March – 17 August
Pumpkin11 February – 4 June25 March – 16 July15 April – 16 July
Purple coneflowerfrom 30 November—from 21 February
Radish——sow 21 February – 11 October
Sage13 December – 3 August31 January – 21 September21 February – 21 September
Scarlet sagefrom 9 January—from 23 March
Snapdragonfrom 27 Novemberfrom 31 Januaryfrom 21 February
Soybean——sow 15 April – 22 August
Spinach——sow 21 February – 16 September
Stevia12 January – 24 June2 March – 12 August23 March – 12 August
Stock——sow from 21 February
Sunflower——sow from 5 April
Sweet alyssum——sow from 21 February
Sweet Corn6 February – 17 August28 February – 8 September21 March – 8 September
Sweet peafrom 20 Decemberfrom 31 Januaryfrom 21 February
Sweet William——sow from 21 February
Swiss Chard——sow 21 February – 11 September
Thyme——sow 21 February – 23 July
Tomato9 January – 30 May2 March – 21 July23 March – 21 July
Turnip——sow 21 February – 13 September
Watercress——sow 21 February – 24 September
Watermelon25 February – 4 July25 March – 1 August15 April – 1 August
Zinniafrom 9 Marchfrom 13 Aprilfrom 4 May
Zucchini4 March – 3 August25 March – 24 August15 April – 24 August

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

What planting zone is Oklahoma City?

The official USDA map (2023, 1991–2020 data) puts the centre of Oklahoma City (ZIP 73102) in zone 7b. Zone 7b stands for an average coldest night of 5 to 10 °F (-15 to -12.2 °C), so perennials hardy to zone 7b or a colder zone should come through a typical winter here.

Check the official USDA map for Oklahoma City: USDA Plant Hardiness Zone Map.

When the soil warms up in Oklahoma City

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 22 days before the last spring frost and 15 °C 9 days after it.

SoilDateAgainst the last spring frost
5 °C17 January56 days earlier
10 °C20 February22 days earlier
15 °C23 March9 days later
18 °C15 April32 days later

Frost dates near Oklahoma City

Of the nearest cities on our list, the last spring frost ends earliest in Fort Worth (19 February) and latest in Wichita (3 April).

CityDistanceLast spring frostFirst autumn frost
Lawton126 km1 March11 November
Tulsa157 km6 March17 November
Wichita247 km3 April30 October
Fort Smith285 km16 March18 November
Fort Worth305 km19 February30 November

Seeds, seedlings and markets in Oklahoma City

Within 15 km of Oklahoma City OpenStreetMap lists 3 garden centres, 2 farm-supply shops and 4 markets (collected 20 October 2026). The nearest garden centre to the city centre is Smith Farm and Garden, 6 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Oklahoma City

Frosts in Oklahoma City usually come from about 10 November to about 14 March. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in Oklahoma City by month

Average weather in Oklahoma City over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: April–October (22.6–34.2 °C). Months that average 30 °C or more by day: June–September (30.1–34.2 °C). Nights average below 0 °C in January (-0.7 °C). About 888 mm of rain falls in a year, on 90 days; April is the wettest month (123 mm) and December the driest (35 mm).

MonthDay, °CNight, °CRain, mmRainy days
January9.7-0.7415
February12.81476
March19.27.2708
April22.610.712310
May26.616.211912
June31.721.4939
July34.223.8689
August33.423.2708
September30.119.8877
October23.913.2857
November16.86.7505
December12.42.4354

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropWhen to plant
Bearded Irisby 11 October
Crocusby 11 October
Daffodilby 11 October
Garlic11 October – end of December
Grape hyacinthby 11 October
Helleboreby 11 October
Hyacinthby 11 October
Lilyby 11 October
Ornamental onionby 11 October
Peonyby 11 October
Saffronby 11 October
Snowdropby 11 October
Tulipby 11 October
Wild garlicby 11 October

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).