Frost dates for 74074 — Stillwater, OK
Last spring frostApr 5median date
First fall frostOct 30median date
Growing season208 daysfrost-free
Hardiness zone7aZone 7a
How Stillwater compares
- In 8 years out of 10, the last spring frost in Stillwater falls between March 21 and April 21, a 31-day window. The first fall frost falls between October 16 and November 15.
- The median last frost is 1 day later than the Oklahoma median of Apr 4.
- Its 208-day growing season is longer than 32% of the 582 Oklahoma places with a regular frost season (state median 211 days).
- The last frost is 11 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 88 nights a year at or below 32°F.
- Compared with Edmond, OK, 62 km away, the last frost here is 3 days later than there and the growing season is 9 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 21 |
| 50% (median) | April 5 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 16 |
| 50% (median) | October 30 |
| 90% (late) | November 15 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Stillwater, OK
Frost dates for 74074 — Stillwater, OK — last frost Apr 5, first frost Oct 30, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 11 to Jan 25Transplant outside: Mar 8 to Mar 22
Start indoors: Jan 25 to Feb 8Transplant outside: Apr 19 to May 3
Start indoors: Jan 25 to Feb 8Transplant outside: Apr 19 to May 3
Start indoors: Feb 8 to Feb 22Transplant outside: Apr 12 to Apr 26
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 8 to Apr 12Plant for fall: Sep 4 to Oct 2
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 8 to Mar 22Sow outdoors: Mar 8 to Mar 22Plant for fall: Aug 21 to Sep 11
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 15 to Mar 29Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 26 to May 10Sow outdoors: Apr 26 to May 10
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 12 to Apr 26
Sow outdoors: Feb 22 to Mar 15Plant for fall: Aug 7 to Aug 28
Sow outdoors: Feb 22 to Mar 15Plant for fall: Sep 4 to Sep 25
Sow outdoors: Mar 1 to Apr 12Plant for fall: Sep 18 to Oct 9
Start indoors: Mar 8 to Mar 15Transplant outside: Apr 19 to Apr 26Sow outdoors: Apr 12 to Apr 26Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 8 to Mar 15Sow outdoors: Apr 12 to Apr 26Plant for fall: Aug 21 to Sep 4
Start indoors: Mar 8 to Mar 15Sow outdoors: Apr 12 to Apr 26
Start indoors: Mar 8 to Mar 15Transplant outside: Apr 19 to May 3
Sow outdoors: Mar 15 to Apr 12Plant for fall: Aug 7 to Aug 21
Sow outdoors: Mar 15 to Apr 12Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 15 to Apr 5
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 22 to Apr 12Plant for fall: Sep 4 to Sep 25
Sow outdoors: Apr 12 to May 3Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 12 to Apr 26
Transplant outside: Apr 19 to May 10
Plant for fall: Oct 16 to Nov 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Stillwater, OK
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 11 – Jan 25 | Mar 8 – Mar 22 | — | — |
| Peppers | Jan 25 – Feb 8 | Apr 19 – May 3 | — | — |
| Eggplant | Jan 25 – Feb 8 | Apr 19 – May 3 | — | — |
| Tomatoes | Feb 8 – Feb 22 | Apr 12 – Apr 26 | — | — |
| Lettuce | Feb 8 – Feb 22 | Mar 15 – Mar 29 | Mar 8 – Apr 12 | Sep 4 – Oct 2 |
| Kale | Feb 8 – Feb 22 | Mar 8 – Mar 22 | Mar 8 – Mar 22 | Aug 21 – Sep 11 |
| Broccoli | Feb 8 – Feb 22 | Mar 22 – Apr 5 | — | Jul 24 – Aug 14 |
| Cabbage | Feb 8 – Feb 22 | Mar 15 – Mar 29 | — | Jul 24 – Aug 14 |
| Cauliflower | Feb 8 – Feb 22 | Mar 22 – Apr 5 | — | Jul 24 – Aug 14 |
| Okra | Feb 22 – Mar 8 | Apr 26 – May 10 | Apr 26 – May 10 | — |
| Basil | Feb 22 – Mar 8 | Apr 12 – Apr 26 | — | — |
| Peas | — | — | Feb 22 – Mar 15 | Aug 7 – Aug 28 |
| Spinach | — | — | Feb 22 – Mar 15 | Sep 4 – Sep 25 |
| Radishes | — | — | Mar 1 – Apr 12 | Sep 18 – Oct 9 |
| Cucumbers | Mar 8 – Mar 15 | Apr 19 – Apr 26 | Apr 12 – Apr 26 | Aug 14 – Aug 28 |
| Zucchini & Summer Squash | Mar 8 – Mar 15 | — | Apr 12 – Apr 26 | Aug 21 – Sep 4 |
| Winter Squash & Pumpkins | Mar 8 – Mar 15 | — | Apr 12 – Apr 26 | — |
| Melons & Watermelon | Mar 8 – Mar 15 | Apr 19 – May 3 | — | — |
| Carrots | — | — | Mar 15 – Apr 12 | Aug 7 – Aug 21 |
| Beets | — | — | Mar 15 – Apr 12 | Aug 21 – Sep 4 |
| Potatoes | — | — | Mar 15 – Apr 5 | — |
| Swiss Chard | — | — | Mar 22 – Apr 19 | Aug 21 – Sep 4 |
| Cilantro | — | — | Mar 22 – Apr 12 | Sep 4 – Sep 25 |
| Green Beans | — | — | Apr 12 – May 3 | Aug 14 – Aug 28 |
| Sweet Corn | — | — | Apr 12 – Apr 26 | — |
| Sweet Potatoes | — | Apr 19 – May 10 | — | — |
| Garlic | — | — | — | Oct 16 – Nov 20 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Stillwater 2 W, OK weather station, 3 km away (elevation 889 ft (271 m)).
ZIP codes in Stillwater: 74074 74075 74076 74077 74078
Frost dates near Stillwater
- Perkins Apr 4 · Nov 2
- Glencoe Apr 3 · Oct 31
- Ripley Apr 1 · Nov 5
- Morrison Apr 8 · Oct 28
- Langston Apr 3 · Nov 1
- Tryon Apr 4 · Nov 2
- Agra Apr 1 · Nov 5
- Perry Apr 4 · Nov 1
Frequently asked questions
When is the last frost in Stillwater, OK?
The median last spring frost in Stillwater, OK is April 5. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Stillwater, OK?
The median first fall frost is October 30, with about a 10% chance of frost before October 16.
How long is the growing season in Stillwater, OK?
About 208 days between the median last spring frost and first fall frost.
What planting zone is Stillwater, OK?
Stillwater, OK is in USDA hardiness zone 7a.