Frost dates for 73160Oklahoma City, OK
The average last spring frost in Oklahoma City is April 4 and the average first fall frost is November 2, giving a typical growing season of about 213 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 4
- Average first fall frost
- Nov 2
- Growing season
- 213 days
Safer after Apr 20 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 6 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 31 · Apr 15 · Apr 30 | Oct 12 · Oct 26 · Nov 7 | 192 days | 100% |
| Frost / freeze (32°F) | Mar 16 · Apr 4 · Apr 20 | Oct 21 · Nov 2 · Nov 17 | 213 days | 100% |
| Hard freeze (28°F) | Mar 3 · Mar 21 · Apr 7 | Oct 29 · Nov 11 · Nov 27 | 234 days | 100% |
Planting calendar for Oklahoma City
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 4 – May 10 |
| Tomatoes | Transplant outdoors | Apr 20 – Jul 13 |
| Peppers | Start seeds indoors | Mar 4 – Apr 4 |
| Peppers | Transplant outdoors | May 4 – Jun 4 |
| Eggplant | Start seeds indoors | Mar 21 – Apr 19 |
| Eggplant | Transplant outdoors | May 4 – Jun 4 |
| Cucumbers | Sow outdoors | May 4 – Jul 23 |
| Summer squash | Sow outdoors | Apr 20 – Jun 4 |
| Winter squash & pumpkins | Sow outdoors | May 4 – Jun 4 |
| Snap beans | Sow outdoors | Apr 20 – Aug 15 |
| Sweet corn | Sow outdoors | Apr 20 – Jul 13 |
| Watermelon & cantaloupe | Sow outdoors | May 4 – Jun 4 |
| Okra | Sow outdoors | Apr 27 – May 20 |
| Peas | Sow outdoors (spring) | Mar 4 – Apr 19 |
| Potatoes | Plant outdoors (spring) | Mar 4 – May 4 |
| Onions | Start seeds indoors (spring) | Jan 21 – Feb 17 |
| Onions | Transplant outdoors (spring) | Mar 21 – Apr 19 |
| Broccoli | Start seeds indoors (spring) | Feb 14 – Mar 20 |
| Broccoli | Transplant outdoors (spring) | Mar 21 – Apr 19 |
| Broccoli | Start seeds indoors (fall) | Jul 3 – Jul 13 |
| Broccoli | Transplant outdoors (fall) | Aug 2 – Aug 13 |
| Cabbage | Start seeds indoors (spring) | Feb 4 – Mar 4 |
| Cabbage | Transplant outdoors (spring) | Mar 4 – Apr 4 |
| Cabbage | Start seeds indoors (fall) | Jun 23 – Jul 23 |
| Cabbage | Transplant outdoors (fall) | Jul 23 – Aug 23 |
| Leaf lettuce | Sow outdoors (spring) | Mar 4 – May 20 |
| Leaf lettuce | Sow outdoors (fall) | Jul 23 – Sep 8 |
| Spinach | Sow outdoors (spring) | Feb 25 – Apr 10 |
| Spinach | Sow outdoors (fall) | Aug 9 – Sep 13 |
| Radishes | Sow outdoors (spring) | Mar 4 – Apr 24 |
| Radishes | Sow outdoors (fall) | Jul 23 – Sep 23 |
| Kale | Sow outdoors (spring) | Mar 21 – Apr 10 |
| Kale | Sow outdoors (fall) | Jul 16 – Aug 23 |
| Carrots | Sow outdoors (spring) | Apr 4 – May 20 |
| Carrots | Sow outdoors (fall) | Jun 23 – Aug 8 |
| Garlic | Plant outdoors (fall) | Oct 23 – Nov 23 |
Where these dates come from
ZIP code 73160 is matched to the NOAA station Oklahoma City Will Rogers Ap, OK, 12.8 km away, at 1,285 ft elevation (61 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Oklahoma City Will Rogers Ap, OK (used) | 1,285 ft | Apr 4 | Nov 2 |
| Norman 2Nw Mesonet, OK | 1,181 ft | Mar 31 | Nov 5 |
| Norman 3Sse, OK | 1,128 ft | Apr 3 | Nov 3 |
| Spencer 2Ene Mesonet, OK | 1,223 ft | Apr 2 | Nov 5 |
Frost dates near Oklahoma City
- Oklahoma City, OK 73149 · last Apr 4, first Nov 2
- Norman, OK 73069 · last Apr 3, first Nov 3
- Newcastle, OK 73065 · last Apr 3, first Nov 4
- Wheatland, OK 73097 · last Apr 4, first Nov 2
- Nicoma Park, OK 73066 · last Apr 2, first Nov 5
- Washington, OK 73093 · last Apr 3, first Nov 3
- Spencer, OK 73084 · last Apr 2, first Nov 5
- Mustang, OK 73064 · last Apr 4, first Nov 2
Frequently asked questions
- When is the last frost in Oklahoma City, OK?
- For ZIP code 73160, the average last spring frost (32°F) is April 4, based on NOAA 1991-2020 climate normals for the Oklahoma City Will Rogers Ap, OK weather station. There is a 1-in-10 chance of a frost after April 20.
- When is the first frost in Oklahoma City, OK?
- The average first fall frost (32°F) is November 2. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 73160?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 213 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.