Frost dates for 73659Putnam, OK
The average last spring frost in Putnam is April 8 and the average first fall frost is November 1, giving a typical growing season of about 204 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Nov 1
- Growing season
- 204 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
Last frost typically in 156 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 4 · Apr 19 · May 2 | Oct 9 · Oct 23 · Nov 4 | 184 days | 100% |
| Frost / freeze (32°F) | Mar 21 · Apr 8 · Apr 24 | Oct 18 · Nov 1 · Nov 15 | 204 days | 100% |
| Hard freeze (28°F) | Mar 6 · Mar 27 · Apr 13 | Oct 23 · Nov 8 · Nov 25 | 226 days | 100% |
Planting calendar for Putnam
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 12 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 22 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 73659 is matched to the NOAA station Putnam 3N Mesonet, OK, 5 km away, at 1,932 ft elevation (10 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Putnam 3N Mesonet, OK (used) | 1,932 ft | Apr 8 | Nov 1 |
| Taloga, OK | 1,715 ft | Apr 18 | Oct 21 |
| Seiling 7Wnw Mesonet, OK | 1,788 ft | Apr 11 | Oct 25 |
| Clinton, OK | 1,570 ft | Apr 13 | Oct 28 |
Frost dates near Putnam
- Taloga, OK 73667 · last Apr 18, first Oct 21
- Custer City, OK 73639 · last Apr 13, first Oct 28
- Thomas, OK 73669 · last Apr 3, first Nov 3
- Oakwood, OK 73658 · last Apr 18, first Oct 21
- Fay, OK 73646 · last Apr 6, first Nov 3
- Arapaho, OK 73620 · last Apr 13, first Oct 28
- Seiling, OK 73663 · last Apr 18, first Oct 21
- Camargo, OK 73835 · last Apr 15, first Oct 23
Frequently asked questions
- When is the last frost in Putnam, OK?
- For ZIP code 73659, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Putnam 3N Mesonet, OK weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Putnam, OK?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 18, so tender plants are at risk from that point on.
- How long is the growing season in 73659?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 204 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.