Frost dates for 73950Turpin, OK
The average last spring frost in Turpin is April 17 and the average first fall frost is October 25, giving a typical growing season of about 189 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 17
- Average first fall frost
- Oct 25
- Growing season
- 189 days
Safer after May 1 (1-in-10 risk)
Possible by Oct 12 (1-in-10 risk)
Last frost typically in 166 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) | Apr 14 · Apr 27 · May 9 | Oct 1 · Oct 17 · Oct 28 | 170 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 17 · May 1 | Oct 12 · Oct 25 · Nov 6 | 189 days | 100% |
| Hard freeze (28°F) | Mar 22 · Apr 6 · Apr 22 | Oct 20 · Nov 2 · Nov 15 | 210 days | 100% |
Planting calendar for Turpin
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 17 – May 23 |
| Tomatoes | Transplant outdoors | May 3 – Jul 5 |
| Peppers | Start seeds indoors | Mar 17 – Apr 17 |
| Peppers | Transplant outdoors | May 17 – Jun 17 |
| Eggplant | Start seeds indoors | Apr 3 – May 2 |
| Eggplant | Transplant outdoors | May 17 – Jun 17 |
| Cucumbers | Sow outdoors | May 17 – Jul 15 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 7 |
| Sweet corn | Sow outdoors | May 3 – Jul 5 |
| Watermelon & cantaloupe | Sow outdoors | May 17 – Jun 17 |
| Okra | Sow outdoors | May 10 – Jun 2 |
| Peas | Sow outdoors (spring) | Mar 17 – May 2 |
| Potatoes | Plant outdoors (spring) | Mar 17 – May 17 |
| Onions | Start seeds indoors (spring) | Feb 3 – Mar 2 |
| Onions | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (spring) | Feb 27 – Apr 2 |
| Broccoli | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (fall) | Jun 25 – Jul 5 |
| Broccoli | Transplant outdoors (fall) | Jul 25 – Aug 5 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 15 – Jul 15 |
| Cabbage | Transplant outdoors (fall) | Jul 15 – Aug 15 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 15 – Aug 31 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Aug 1 – Sep 5 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 15 – Sep 15 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 8 – Aug 15 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 15 – Jul 31 |
| Garlic | Plant outdoors (fall) | Oct 15 – Nov 15 |
Where these dates come from
ZIP code 73950 is matched to the NOAA station Turpin 4 Sse, OK, 6 km away, at 2,705 ft elevation (48 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Turpin 4 Sse, OK (used) | 2,705 ft | Apr 17 | Oct 25 |
| Liberal, KS | 2,834 ft | Apr 20 | Oct 24 |
| Hooker, OK | 3,001 ft | Apr 16 | Oct 25 |
| Beaver, OK | 2,465 ft | Apr 21 | Oct 21 |
Frost dates near Turpin
- Liberal, KS 67905 · last Apr 20, first Oct 24
- Tyrone, OK 73951 · last Apr 20, first Oct 24
- Adams, OK 73901 · last Apr 16, first Oct 25
- Forgan, OK 73938 · last Apr 21, first Oct 21
- Hooker, OK 73945 · last Apr 16, first Oct 25
- Beaver, OK 73932 · last Apr 21, first Oct 21
- Balko, OK 73931 · last Apr 14, first Oct 30
- Hardesty, OK 73944 · last Apr 16, first Oct 25
Frequently asked questions
- When is the last frost in Turpin, OK?
- For ZIP code 73950, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the Turpin 4 Sse, OK weather station. There is a 1-in-10 chance of a frost after May 1.
- When is the first frost in Turpin, OK?
- The average first fall frost (32°F) is October 25. There is a 1-in-10 chance of frost by October 12, so tender plants are at risk from that point on.
- How long is the growing season in 73950?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 189 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.