ZIP 98057 Zone 9a
Washington · USDA zone 9a, average annual extreme minimum 20°F to 25°F.
Nearest qualified station: RENTON MUNI AP, WA US (USW00094248), 1.5 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% | February 19 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 13 | Median. |
| 10% | March 31 | 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 29 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 16 | Median. |
| 90% | December 9 | 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% | 280 |
| 50% | 248 |
| 90% | 221 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 6 | February 13 | January 1 |
| First, on or before | November 11 | December 6 | January 9 |
| Season at least | 341 days | 301 days | 262 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 25 | April 6 | March 21 |
| First, on or before | October 17 | October 31 | November 17 |
| Season at least | 231 days | 207 days | 186 days |
Station RENTON MUNI AP, WA US (USW00094248). Completeness flag R, 19 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 8.8 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.