Frost dates for 73061Morrison, OK
The average last spring frost in Morrison is April 3 and the average first fall frost is October 31, giving a typical growing season of about 209 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 3
- Average first fall frost
- Oct 31
- Growing season
- 209 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 15 (1-in-10 risk)
Last frost typically in 153 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 16 · May 1 | Oct 6 · Oct 22 · Nov 3 | 189 days | 100% |
| Frost / freeze (32°F) | Mar 18 · Apr 3 · Apr 21 | Oct 15 · Oct 31 · Nov 14 | 209 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 23 · Apr 8 | Oct 24 · Nov 8 · Nov 25 | 230 days | 100% |
Planting calendar for Morrison
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 3 – May 9 |
| Tomatoes | Transplant outdoors | Apr 19 – Jul 11 |
| Peppers | Start seeds indoors | Mar 3 – Apr 3 |
| Peppers | Transplant outdoors | May 3 – Jun 3 |
| Eggplant | Start seeds indoors | Mar 20 – Apr 18 |
| Eggplant | Transplant outdoors | May 3 – Jun 3 |
| Cucumbers | Sow outdoors | May 3 – Jul 21 |
| Summer squash | Sow outdoors | Apr 19 – Jun 3 |
| Winter squash & pumpkins | Sow outdoors | May 3 – Jun 3 |
| Snap beans | Sow outdoors | Apr 19 – Aug 13 |
| Sweet corn | Sow outdoors | Apr 19 – Jul 11 |
| Watermelon & cantaloupe | Sow outdoors | May 3 – Jun 3 |
| Okra | Sow outdoors | Apr 26 – May 19 |
| Peas | Sow outdoors (spring) | Mar 3 – Apr 18 |
| Potatoes | Plant outdoors (spring) | Mar 3 – May 3 |
| Onions | Start seeds indoors (spring) | Jan 20 – Feb 16 |
| Onions | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (spring) | Feb 13 – Mar 19 |
| Broccoli | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (fall) | Jul 1 – Jul 11 |
| Broccoli | Transplant outdoors (fall) | Jul 31 – Aug 11 |
| Cabbage | Start seeds indoors (spring) | Feb 3 – Mar 3 |
| Cabbage | Transplant outdoors (spring) | Mar 3 – Apr 3 |
| Cabbage | Start seeds indoors (fall) | Jun 21 – Jul 21 |
| Cabbage | Transplant outdoors (fall) | Jul 21 – Aug 21 |
| Leaf lettuce | Sow outdoors (spring) | Mar 3 – May 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 21 – Sep 6 |
| Spinach | Sow outdoors (spring) | Feb 24 – Apr 9 |
| Spinach | Sow outdoors (fall) | Aug 7 – Sep 11 |
| Radishes | Sow outdoors (spring) | Mar 3 – Apr 23 |
| Radishes | Sow outdoors (fall) | Jul 21 – Sep 21 |
| Kale | Sow outdoors (spring) | Mar 20 – Apr 9 |
| Kale | Sow outdoors (fall) | Jul 14 – Aug 21 |
| Carrots | Sow outdoors (spring) | Apr 3 – May 19 |
| Carrots | Sow outdoors (fall) | Jun 21 – Aug 6 |
| Garlic | Plant outdoors (fall) | Oct 21 – Nov 21 |
Where these dates come from
ZIP code 73061 is matched to the NOAA station Stillwater Rgnl Ap, OK, 15.4 km away, at 984 ft elevation (36 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Stillwater Rgnl Ap, OK (used) | 984 ft | Apr 3 | Oct 31 |
| Red Rock 7Sse Mesonet, OK | 961 ft | Apr 8 | Oct 28 |
| Stillwater 5 Wnw, OK | 888 ft | Apr 12 | Oct 27 |
| Stillwater Mesonet, OK | 892 ft | Apr 6 | Oct 31 |
Frost dates near Morrison
- Glencoe, OK 74032 · last Apr 3, first Oct 31
- Stillwater, OK 74075 · last Apr 5, first Oct 30
- Pawnee, OK 74058 · last Apr 11, first Oct 24
- Perry, OK 73077 · last Apr 4, first Nov 1
- Red Rock, OK 74651 · last Apr 4, first Nov 1
- Maramec, OK 74045 · last Apr 6, first Oct 29
- Ralston, OK 74650 · last Apr 11, first Oct 24
- Marland, OK 74644 · last Apr 10, first Oct 27
Frequently asked questions
- When is the last frost in Morrison, OK?
- For ZIP code 73061, the average last spring frost (32°F) is April 3, based on NOAA 1991-2020 climate normals for the Stillwater Rgnl Ap, OK weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Morrison, OK?
- The average first fall frost (32°F) is October 31. There is a 1-in-10 chance of frost by October 15, so tender plants are at risk from that point on.
- How long is the growing season in 73061?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 209 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.