4-Inch Soil Temperature in Oklahoma
The current average 4-inch soil temperature across Oklahoma is 77°F, measured at 3 USDA and NOAA monitoring stations. Readings range from 75°F to 79°F. Soil across Oklahoma is running 4°F above the seasonal normal of 73°F for late September, based on 3 of 3 stations with historical records. Last updated September 23, 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 Oklahoma (3)
| Station | 4" Temp | Last Reading |
|---|---|---|
| Goodwell 2 E | 75°F | 2026-09-23 |
| Stillwater 2 W | 79°F | 2026-09-22 |
| Stillwater 5 WNW | 76°F | 2026-09-22 |
Cities in Oklahoma (33)
| City | ZIP | Current Temp |
|---|---|---|
| Ada | 74820 | 79°F |
| Altus | 73521 | — |
| Ardmore | 73401 | — |
| Atoka | 74525 | — |
| Bartlesville | 74003 | 79°F |
| Braggs | 74423 | — |
| Broken Arrow | 74011 | 79°F |
| Chickasha | 73018 | 76°F |
| Claremore | 74017 | 79°F |
| Davis | 73030 | — |
| Duncan | 73533 | — |
| Durant | 74701 | — |
| Edmond | 73003 | 76°F |
| Elk City | 73644 | — |
| Enid | 73701 | 76°F |
| Grove | 74344 | — |
| Lawton | 73501 | — |
| Mcalester | 74501 | — |
| Miami | 74354 | — |
| Muskogee | 74401 | 79°F |
| Norman | 73019 | 79°F |
| Oklahoma City | 73101 | 79°F |
| Ponca City | 74601 | 76°F |
| Pryor | 74361 | — |
| Sapulpa | 74066 | 79°F |
| Seminole | 74818 | 79°F |
| Shawnee | 74801 | 79°F |
| Stillwater | 74074 | 79°F |
| Tahlequah | 74464 | — |
| Tulsa | 74101 | 79°F |
| Wagoner | 74467 | 79°F |
| Woodward | 73801 | — |
| Yukon | 73085 | 76°F |
4-Inch Soil Temperature FAQ for Oklahoma
What is the current 4-inch soil temperature in Oklahoma?
The current average 4-inch soil temperature across Oklahoma is 77°F, measured at 3 USDA and NOAA stations. Readings range from 75°F to 79°F depending on location and elevation. Soil across Oklahoma is running 4°F above the seasonal normal of 73°F for late September, 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 Oklahoma soil temperature directory (all depths), the national soil temperature by depth comparison, or the live national soil temperature map.