Frost dates for 97752Post, OR
The average last spring frost in Post is June 2 and the average first fall frost is September 17, giving a typical growing season of about 104 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 2
- Average first fall frost
- Sep 17
- Growing season
- 104 days
Safer after Jun 25 (1-in-10 risk)
Possible by Aug 30 (1-in-10 risk)
Last frost typically in 213 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) | — | — | 71 days | 100% |
| Frost / freeze (32°F) | May 13 · Jun 2 · Jun 25 | Aug 30 · Sep 17 · Oct 1 | 104 days | 100% |
| Hard freeze (28°F) | Apr 26 · May 12 · Jun 1 | Sep 14 · Sep 30 · Oct 16 | 140 days | 100% |
Planting calendar for Post
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 | May 2 – Jul 8 |
| Tomatoes | Transplant outdoors | Jun 18 – May 28 |
| Peppers | Start seeds indoors | May 2 – Jun 2 |
| Peppers | Transplant outdoors | Jul 2 – Aug 2 |
| Eggplant | Start seeds indoors | May 19 – Jun 17 |
| Eggplant | Transplant outdoors | Jul 2 – Aug 2 |
| Cucumbers | Sow outdoors | Jul 2 – Jun 7 |
| Summer squash | Sow outdoors | Jun 18 – Aug 2 |
| Winter squash & pumpkins | Sow outdoors | Jul 2 – Aug 2 |
| Snap beans | Sow outdoors | Jun 18 – Jun 30 |
| Sweet corn | Sow outdoors | Jun 18 – May 28 |
| Watermelon & cantaloupe | Sow outdoors | Jul 2 – Aug 2 |
| Okra | Sow outdoors | Jun 25 – Jul 18 |
| Peas | Sow outdoors (spring) | May 2 – Jun 17 |
| Potatoes | Plant outdoors (spring) | May 2 – Jul 2 |
| Onions | Start seeds indoors (spring) | Mar 21 – Apr 17 |
| Onions | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (spring) | Apr 14 – May 18 |
| Broccoli | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (fall) | May 18 – May 28 |
| Broccoli | Transplant outdoors (fall) | Jun 17 – Jun 28 |
| Cabbage | Start seeds indoors (spring) | Apr 4 – May 2 |
| Cabbage | Transplant outdoors (spring) | May 2 – Jun 2 |
| Cabbage | Start seeds indoors (fall) | May 8 – Jun 7 |
| Cabbage | Transplant outdoors (fall) | Jun 7 – Jul 8 |
| Leaf lettuce | Sow outdoors (spring) | May 2 – Jul 18 |
| Leaf lettuce | Sow outdoors (fall) | Jun 7 – Jul 24 |
| Spinach | Sow outdoors (spring) | Apr 25 – Jun 8 |
| Spinach | Sow outdoors (fall) | Jun 24 – Jul 29 |
| Radishes | Sow outdoors (spring) | May 2 – Jun 22 |
| Radishes | Sow outdoors (fall) | Jun 7 – Aug 8 |
| Kale | Sow outdoors (spring) | May 19 – Jun 8 |
| Kale | Sow outdoors (fall) | May 31 – Jul 8 |
| Carrots | Sow outdoors (spring) | Jun 2 – Jul 18 |
| Carrots | Sow outdoors (fall) | May 8 – Jun 23 |
| Garlic | Plant outdoors (fall) | Sep 7 – Oct 8 |
Where these dates come from
ZIP code 97752 is matched to the NOAA station Barnes Stn, OR, 16.3 km away, at 3,970 ft elevation (800 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Barnes Stn, OR (used) | 3,970 ft | Jun 2 | Sep 17 |
| Paulina, OR | 3,684 ft | — | — |
| Brothers, OR | 4,640 ft | — | — |
| Prineville, OR | 2,876 ft | Jun 1 | Sep 22 |
Frost dates near Post
- Brothers, OR 97712 · last —, first —
- Paulina, OR 97751 · last Jun 2, first Sep 17
- Prineville, OR 97754 · last Jun 1, first Sep 22
- Mitchell, OR 97750 · last May 22, first Oct 4
- Powell Butte, OR 97753 · last Jun 9, first Sep 14
- Redmond, OR 97756 · last Jun 9, first Sep 14
- Dayville, OR 97825 · last May 4, first Oct 6
- Ashwood, OR 97711 · last —, first —
Frequently asked questions
- When is the last frost in Post, OR?
- For ZIP code 97752, the average last spring frost (32°F) is June 2, based on NOAA 1991-2020 climate normals for the Barnes Stn, OR weather station. There is a 1-in-10 chance of a frost after June 25.
- When is the first frost in Post, OR?
- The average first fall frost (32°F) is September 17. There is a 1-in-10 chance of frost by August 30, so tender plants are at risk from that point on.
- How long is the growing season in 97752?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 104 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.