4-Inch Soil Temperature in Oregon
The current average 4-inch soil temperature across Oregon is 72°F, measured at 3 USDA and NOAA monitoring stations. Readings range from 61°F to 81°F. Soil across Oregon is right at the seasonal normal of 73°F for mid-August, based on 3 of 3 stations with historical records. Last updated August 9, 2026.
Why the 4-Inch Reading
Every reading here is measured at native 4-inch depth by USDA SCAN (Soil Climate Analysis Network) and NOAA USCRN (US Climate Reference Network) stations — not modeled. The 4-inch root-zone temperature changes more slowly than the surface, making it the steadier signal for established-lawn and garden timing: pre-emergent and broadleaf herbicide windows, fertilizer applications, and core aeration.
Stations Measuring 4-Inch Depth in Oregon (3)
| Station | 4" Temp | Last Reading |
|---|---|---|
| John Day 35 WNW | 81°F | 2026-08-09 |
| Riley 10 WSW | 75°F | 2026-08-09 |
| Coos Bay 8 SW | 61°F | 2026-08-09 |
Cities in Oregon (16)
| City | ZIP | Current Temp |
|---|---|---|
| Albany | 97321 | — |
| Beaverton | 97003 | — |
| Bend | 97701 | — |
| Corvallis | 97330 | — |
| Eugene | 97401 | — |
| Grants Pass | 97526 | 61°F |
| Gresham | 97030 | — |
| Hillsboro | 97123 | — |
| Klamath Falls | 97601 | — |
| Lake Oswego | 97034 | — |
| Lincoln City | 97367 | — |
| Medford | 97501 | — |
| Portland | 97201 | — |
| Roseburg | 97470 | 61°F |
| Salem | 97301 | — |
| Springfield | 97475 | — |
4-Inch Soil Temperature FAQ for Oregon
What is the current 4-inch soil temperature in Oregon?
The current average 4-inch soil temperature across Oregon is 72°F, measured at 3 USDA and NOAA stations. Readings range from 61°F to 81°F depending on location and elevation. Soil across Oregon is right at the seasonal normal of 73°F for mid-August, based on 3 of 3 stations with historical records.
What does the 4 inch soil temperature mean?
The 4 inch soil temperature shows conditions deeper in the root zone than the 2 inch germination reading. It is commonly used for established lawn, garden, and agricultural timing because it changes more slowly than the surface layer, so it is a steadier signal for fertilizer, aeration, and weed-control decisions.
Why use 4-inch soil temperature instead of 2-inch?
Use 2 inches for germination decisions, since that is where seeds sit. Use the 4 inch soil temperature for established lawn and garden timing: it reads the root zone, changes more slowly than the surface, and is the depth most fertilizer, aeration, and disease guidance references.
See the national 4-inch soil temperature map, the full Oregon soil temperature directory (all depths), or the live national soil temperature map.