ZIP 97321 Zone 8b
Oregon · USDA zone 8b, average annual extreme minimum 15°F to 20°F.
Nearest qualified station: CORVALLIS STATE UNIV, OR US (USC00351862), 2.8 miles from the Census ZCTA internal point for this ZIP.
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | March 22 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 17 | Median. |
| 10% | May 8 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | October 5 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 28 | Median. |
| 90% | November 19 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 227 |
| 50% | 194 |
| 90% | 163 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 5 | March 1 | January 25 |
| First, on or before | October 22 | November 17 | December 18 |
| Season at least | 301 days | 259 days | 216 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | June 2 | May 11 | April 25 |
| First, on or before | September 23 | October 10 | October 28 |
| Season at least | 176 days | 151 days | 122 days |
Station CORVALLIS STATE UNIV, OR US (USC00351862). Completeness flag S, 27 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 68.6 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.