Tucson, Arizona · Nov 11, 2026
Soil temperature today in Tucson
low 68°F · high 83°F
Modelled by NOAA GFS · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 7.6 km from Tucson
What the soil says today
- Pre-emergentSeason over
- Cool-season seedToo late in the season
- Warm-season seedWarm enough
- TomatoesSoil warm enough
- Peas and lettuceWarm enough
From the 5-day mean of the modelled 0–4 in layer.
Soil temperature, 0–4 in: last 7 days and next 7
°F. Dots and line: daily average (dashed = forecast); bars: the day's low to high; green band: the 50–55°F pre-emergent window.
- Daily average
- Low to high
- 50–55°F window
View as table
| Day | Average | Low | High | |
|---|---|---|---|---|
| Nov 4 | 73.2°F | 67.2°F | 80.2°F | analysis |
| Nov 5 | 72.9°F | 66.5°F | 80.9°F | analysis |
| Nov 6 | 72.1°F | 68.1°F | 77.3°F | analysis |
| Nov 7 | 72.2°F | 66.7°F | 79.2°F | analysis |
| Nov 8 | 72.5°F | 67.0°F | 79.0°F | analysis |
| Nov 9 | 72.8°F | 66.8°F | 80.8°F | analysis |
| Nov 10 | 74.0°F | 67.9°F | 82.1°F | analysis |
| Today | 74.7°F | 68.3°F | 83.0°F | forecast |
| Nov 12 | 74.9°F | 68.8°F | 82.4°F | forecast |
| Nov 13 | 73.8°F | 70.1°F | 76.4°F | forecast |
| Nov 14 | 70.6°F | 66.9°F | 74.7°F | forecast |
| Nov 15 | 70.5°F | 65.0°F | 78.2°F | forecast |
| Nov 16 | 72.0°F | 66.3°F | 79.6°F | forecast |
| Nov 17 | 73.2°F | 67.8°F | 80.5°F | forecast |
What the soil says for each job
Today's verdicts use the 5-day mean of the modelled 0–4 in layer.
| Job | Soil rule | Today |
|---|---|---|
| Crabgrass pre-emergent | Apply while the soil holds 50 to 55°F, before crabgrass germinates at about 55°F | Season over Soil here stayed above 50°F all last winter, so the 50 to 55°F soil rule gives no spring window. Time pre-emergent to your local calendar. |
| Seed or overseed cool-season grass | Fescue, bluegrass and ryegrass germinate best in soil of 50 to 65°F | Too late in the season Past the usual Aug 15 to Oct 15 seeding window (73°F soil today). |
| Seed warm-season grass | Bermuda, zoysia and centipede need soil of 65°F or more | Warm enough 73°F: at or over 65°F. |
| Plant out tomatoes | Tomato roots want soil of 60°F or more (check your frost date as well) | Soil warm enough 73°F: at or over 60°F. Plant only after your last frost. |
| Sow peas, lettuce and spinach | Cool-weather crops germinate once soil reaches about 40°F | Warm enough 73°F: at or over 40°F. |
The 2026 season so far
°F, daily average of the 0–4 in layer since 1 January (dashed = forecast). Dots: the days the soil began to hold 50°F and 55°F.
- Daily average
- 50–55°F window
When the soil crossed each threshold
2026, from the 5-day mean held for 10 days or more.
| Soil | What it means | Held from (spring 2026) | Fell below (autumn 2026) |
|---|---|---|---|
| 40°F | Peas and lettuce can be sown | never below | not yet |
| 50°F | Pre-emergent window opens | never below | not yet |
| 55°F | Crabgrass can germinate | never below | not yet |
| 60°F | Warm enough for tomatoes | Jan 16 | not yet |
| 65°F | Warm-season grass seed | Feb 3 | not yet |
Growing degree days in Tucson
Base 50°F, from 1 January to Nov 8, at the Tucson Intl Airport station (10.4 km).
A growing degree day is each degree that the day's average temperature runs above 50°F. Insects, weeds and crops develop by accumulated GDD, so the number says how far the season has run. Every city.
Soil temperature nearby
Each from a different model grid cell.
| City | Distance | Soil today | vs a week ago | Grass seed |
|---|---|---|---|---|
| Sahuarita, AZ | 29 km | 66°F | +2°F | Too late in the season |
| Marana, AZ | 37 km | 68°F | +2°F | Too late in the season |
| Sierra Vista, AZ | 95 km | 59°F | −1°F | Too late in the season |
| Nogales, AZ | 98 km | 62°F | ±0°F | Too late in the season |
| Casa Grande, AZ | 107 km | 69°F | +1°F | Too late in the season |
| San Tan Valley, AZ | 122 km | 68°F | +2°F | Too late in the season |
This page also covers Casas Adobes (13 km), Catalina Foothills (8.5 km), Oro Valley (19.2 km), Drexel Heights (13.1 km), Tanque Verde (18.1 km), Flowing Wells (11.2 km): they share the same model grid cell area, within 25 km.
Questions
- What is the soil temperature in Tucson today?
- About 75°F on average in the top 4 inches (0–10 cm), with a low of 68°F and a high of 83°F, from NOAA's GFS model run of Nov 11, 12:00 UTC (7 am Eastern).
- Is it time to put down crabgrass preventer in Tucson?
- Soil here stayed above 50°F all last winter, so the 50 to 55°F soil rule gives no spring window. Time pre-emergent to your local calendar.
- When did the soil in Tucson reach 55°F this year?
- It never dropped below 55°F last winter.
- How accurate is a modelled soil temperature?
- Against NOAA's 108 reference stations the model's daily average was off by 4.2°F on average, and within 5°F on 68% of days. A shaded, mulched or watered yard can differ more.
Data: Global Forecast System (GFS) 0.25°, soil temperature 0–10 cm (TSOIL) (NOAA National Centers for Environmental Prediction (NCEP)); U.S. Climate Reference Network (USCRN) hourly data, version 2 (soil temperature at 5 cm and 10 cm, air temperature) (NOAA National Centers for Environmental Information (NCEI)); Global Historical Climatology Network - Daily (GHCN-Daily), daily maximum and minimum temperature (NOAA National Centers for Environmental Information (NCEI)); GeoNames gazetteer (cities15000) (GeoNames).