Stillwater, Oklahoma planting calendar and frost dates
Stillwater is in USDA hardiness zone 7a. The last spring frost typically comes around April 3 and the first fall frost around October 31, giving about 209 frost-free days a year.
- Hardiness zone
- Zone 7a
- Typical last frost
- April 3
- Typical first frost
- October 31
- Frost-free season
- 209 days
Frost dates in Stillwater
Last spring frost
- March 18Risky: frost later than this in 9 years out of 10
- April 3Typical: a later frost in half of years
- April 21Safe: a later frost only 1 year in 10
First fall frost
- October 15Risky: frost earlier than this 1 year in 10
- October 31Typical: an earlier frost in half of years
- November 14Late: frost before this in 9 years out of 10
The growing season between the typical last and first frosts is about 209 days. Frost here means a low of 32°F at the weather station. A hard freeze (28°F), which damages most hardy crops too, typically ends around March 23 and returns around November 8.
NOAA U.S. Climate Normals 1991-2020 for Stillwater Rgnl Airport, 0.6 miles SW of the city center. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.
What to plant each month in Stillwater
January
Start indoors: broccoli, cabbages, cauliflower, collard greens, kale, leeks, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, snapdragons
February
Start indoors: basil, black-eyed susans, broccoli, cabbages, cauliflower, celery, chives, cilantro, collard greens, eggplants, ginger, leeks, lettuce, marigolds, nasturtiums, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons, spinach, swiss chard, tomatoes
Plant or sow outdoors: black-eyed susans, blueberries, garlic, grapes, grass seed, hollyhocks, kale, onions, peas, poppies, raspberries, rhubarb, strawberries, turnips, wildflowers
March
Start indoors: basil, cantaloupes, cilantro, cosmos, cucumbers, marigolds, nasturtiums, okra, pumpkins, ranunculus, tomatoes, watermelons, winter squash, zucchini
Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garlic, gladioli, grapes, grass seed, green onions, hollyhocks, kale, kentucky bluegrass, leeks, lettuce, onions, parsley, peas, perennial ryegrass, poppies, potatoes, radishes, ranunculus, raspberries, rhubarb, roses, snapdragons, spinach, strawberries, sweet peas, swiss chard, tall fescue, turnips, wildflowers
April
Start indoors: cosmos, okra, pumpkins, winter squash, zinnias
Plant or sow outdoors: asparagus, basil, beets, cantaloupes, carrots, chives, cilantro, cucumbers, dahlias, dill, eggplants, figs, garden mums, ginger, gladioli, grapes, green beans, green onions, kentucky bluegrass, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, oregano, parsley, peppers, perennial ryegrass, petunias, pumpkins, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet peas, swiss chard, tall fescue, thyme, tomatoes, watermelons, winter squash, zucchini
May
Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, garden mums, green onions, okra, peanuts, pumpkins, st. augustinegrass, sweet potatoes, winter squash, zinnias, zoysiagrass
June
Plant or sow outdoors: bermudagrass, centipedegrass, st. augustinegrass, zinnias, zoysiagrass
July
Plant for fall: brussels sprouts
August
Plant for fall: bearded irises, beets, broccoli, brussels sprouts, cabbages, carrots, cauliflower, collard greens, daylilies, kale, lettuce, peas, radishes, snapdragons, spinach, swiss chard, turnips
September
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hydrangeas, kale, kentucky bluegrass, lettuce, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, snapdragons, spinach, tall fescue, tulips, turnips
October
Plant for fall: crocuses, daffodils, daylilies, garlic, grass seed, hostas, hyacinths, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, saffron, tall fescue, tulips
November
Plant for fall: crocuses, garlic, hyacinths, ornamental alliums, tulips
December
Start indoors: onions
Frost dates and zones by ZIP code in Stillwater
Stillwater's 2 main ZIP codes take their frost dates from 2 different NOAA stations: the typical last frost ranges from April 3 in 74075 to April 5 in 74074. Every one of them is in zone 7a.
Planting dates for popular crops in Stillwater
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Feb 15 to Mar 1 | Apr 12 to 26 | — |
| Strawberries | — | Feb 20 to Mar 6 | — |
| Lettuce | Feb 6 to 20 | Mar 27 to Apr 10 | Aug 1 to Sep 5 |
| Cilantro | Feb 20 to Mar 6 | Apr 3 to 10 | — |
| Basil | Feb 22 to Mar 8 | Apr 12 to 19 | — |
| Potatoes | — | Mar 13 to 20 | — |
| Garlic | — | Feb 20 to Mar 6 | Oct 31 to Nov 14 |
| Onions | Dec 12 to Jan 23 | Mar 6 to 20 | — |
| Cucumbers | Mar 15 to 29 | Apr 12 to 26 | — |
| Pumpkins | Mar 20 to Apr 3 | Apr 17 to May 1 | — |
| Peppers | Jan 25 to Feb 22 | Apr 12 to 26 | — |
| Carrots | — | Mar 13 to Apr 3 | Aug 8 to 29 |
| Sweet Potatoes | — | May 1 to 8 | — |
| Watermelons | Mar 8 to 22 | Apr 12 to 26 | — |
| Sweet Corn | — | Apr 3 to 17 | — |
| Green Beans | — | Apr 12 to 26 | — |
| Zucchini | Mar 15 to 29 | Apr 12 to 26 | — |
| Broccoli | Jan 16 to Feb 6 | Mar 6 to 20 | Aug 15 to Sep 12 |
| Peas | — | Feb 20 to Mar 6 | Aug 8 to 22 |
| Spinach | Feb 20 to 27 | Mar 27 to Apr 10 | Aug 22 to Sep 26 |
| Sunflowers | — | Apr 3 to 24 | — |
| Zinnias | Apr 20 to 27 | May 18 to Jun 1 | — |
| Tulips | — | — | Sep 19 to Nov 14 |
| Daffodils | — | — | Sep 19 to Oct 31 |
| Grass Seed | — | Feb 20 to Mar 6 | Sep 19 to Oct 3 |
Nearby cities
- Edmond, OK zone 7b, last frost Apr 4
- Enid, OK zone 7a, last frost Apr 6
- Midwest City, OK zone 7b, last frost Apr 4
- Oklahoma City, OK zone 7b, last frost Apr 4
- Moore, OK zone 7b, last frost Apr 4
- Norman, OK zone 7b, last frost Apr 4
Planting in OklahomaAbout zone 7aPrintable calendar for Stillwater
Questions
When is the last frost in Stillwater?
Around April 3 in a typical year, based on NOAA's 1991-2020 records for Stillwater Rgnl Airport. There is still a 1 in 10 chance of frost after April 21.
What planting zone is Stillwater in?
USDA hardiness zone 7a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in Stillwater?
Start seeds indoors February 15 to March 1 and set plants out April 12 to 26; the safest date to plant out is after April 21.
When is the first frost in Stillwater?
Around October 31 in a typical year, and before October 15 about 1 year in 10.