Soil Temperature in Auburn, CA

Current soil temperature: 78°F at the 2-inch depth, 3.5°F above the historical average for this date. Modeled estimate for July 4, 2026; the nearest sensor station is more than 75 miles away. Rising 6.6°F over the last 7 days.

MODELED ESTIMATE · NO NEARBY SENSOR

3.5 degrees above historical average of 74 degrees Fahrenheit Rising 6.6°F over 7 days

2-inch depth (5 cm)

Confidence: LowNo nearby sensors. Showing modeled estimates Yosemite Village 12 W, 109.1 mi away

No sensor station within 75 miles.This reading is a modeled estimate from Open-Meteo's ERA5-Land archive.

Advanced options (year, as-of date)

Recommendations

Planning the year

See Auburn schedule

Fertilizer

IN WINDOW

Summer iron (foliar) application

A foliar iron spray darkens the lawn's color without forcing the leaf growth a nitrogen feeding would, which is exactly what summer-stressed turf needs. Iron is taken up directly through the leaves, so results show in days rather than weeks. Shallow soil temperatures are in the action band at 78°F at 2 inches from the Open-Meteo ERA5-Land modeled estimate.

Details for Summer iron (foliar) application
Confidence	MODERATE CONFIDENCE

Additional detail

Trigger: 2-inch soil holds 70°F
Source: Open-Meteo ERA5-Land modeled estimate

Source: Open-Meteo ERA5-Land modeled estimate

Pest Watch

IN WINDOW

White-grub emergence watch

White grubs are the larvae of Japanese beetles, June bugs, and similar species, and they feed on grass roots through summer. Catching the first generation in early summer, before significant root damage, makes preventive insecticide much more effective than rescue treatments. Shallow soil temperatures are in the action band at 78°F at 2 inches from the Open-Meteo ERA5-Land modeled estimate.

Details for White-grub emergence watch
Confidence	MODERATE CONFIDENCE

Additional detail

Trigger: 2-inch soil holds 70°F
Source: Open-Meteo ERA5-Land modeled estimate

Source: Open-Meteo ERA5-Land modeled estimate

Daily Soil Temperature (Estimated)

Depth: 2" • 28 days of data • Estimated, Open-Meteo

Showing chart

Reference Station (data unavailable)

Yosemite Village 12 W (Site USCRN-53150), CA

Distance: 109 miles from Auburn, CA
Elevation: 5134 ft
Coordinates: 37.7600, -119.8200

Estimated Soil Temperatures

7-day soil temperature readings
Date	2" °F	Δ 2"	8" °F	20" °F
Jul 4	77.7	+2.2	74.9	70.6
Jul 3	75.5	+1.7	73.2	70.3
Jul 2	73.8	-0.3	72.5	70.1
Jul 1	74.1	-0.5	72.9	70.0
Jun 30	74.6	+1.9	72.7	69.7
Jun 29	72.7	+1.6	71.3	69.7
Jun 28	71.1	—	70.4	70.0

Soil temperature by depth

77.7°F

2 in · germination

74.9°F

8 in · deeper trend

70.6°F

20 in · deep soil

Estimated soil temperatures for this location provided by Open-Meteo.

Check the current soil temp at your location, or open the live US soil temperature mapto see today’s ground readings from 380+ USDA and NOAA stations across the country. Enter your ZIP code for live soil temperatures near you, plus planting windows, pre-emergent timing, fertilizer guidance, and disease watch alerts for your area.

How Soil Temperature Drives Lawn Timing

About the Data

Readings refresh nightly from the USDA-NRCS Soil Climate Analysis Network and the NOAA US Climate Reference Network (USCRN). Where no station is within 75 miles, readings are modeled estimates from Open-Meteo’s ERA5-Land archive rather than direct sensor measurements; see how we measure. Planting windows are derived from multi-year climatology overlaid with NOAA 1991–2020 frost normals. Recommendation cards evaluate current soil conditions against research-backed thresholds from university extension sources. Check back regularly as conditions change. The guidance updates with every new reading.

Data sources: USDA-NRCS SCAN network, NOAA USCRN, NOAA 1991–2020 climate normals, and localized frost climatology via Soil Temps analytics.

Browse soil temperature data by state, over 2,000 cities with current readings, hardiness zones, and planting windows.

Explore the US Soil Temperature Map for a live station view of readings across the country.

Soil Conditions in Auburn, CA

USDA Growing Zone

Zone 9B

Average First Frost

October 22

Elevation

5,134 ft

Cool-Season Viability

Warm-season only

This area favors warm-season grasses; cool-season grass struggles through the summer heat here. As of July 5, the 2-inch soil temperature is running 4°F above the 10-year normal for this date. No federal soil station is close enough for direct readings, so values here are modeled from the nearest Open-Meteo grid cell. Use as a directional guide.

For established lawns and gardens, the 4 inch soil temperature is a more useful reading than the surface. This 4-inch root-zone depth changes more slowly than the 2-inch surface layer, so it is a steadier signal for timing fertilizer, aeration, and weed control. The depths your nearest station reports are shown above; stations in the federal network typically report 2, 4, 8, 20, and 40 inches, while modeled estimates for areas far from a station cover fewer depths.

When to apply pre-emergent herbicide →

View historical soil temperature data →

Soil Temperature FAQ

What soil temperature is needed to plant grass seed?

Cool-season grasses like fescue and bluegrass germinate best when soil at 2 inches stays between 50–65°F for several consecutive days. Warm-season grasses like Bermuda and Zoysia need soil temperatures of 65–70°F or higher before seeding.

How deep should I measure soil temperature?

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. The 8 inch reading shows deeper root-zone trend. The 20 and 40 inch readings track deep soil and frost depth where federal stations report them.

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.

What’s the difference between soil temperature and air temperature?

Soil changes temperature much more slowly than air due to thermal mass. A warm afternoon does not mean the ground is warm. Soil temperature lags air temperature by days or weeks, making it a more reliable indicator of when biological processes like germination actually begin.

When should I apply pre-emergent based on soil temperature?

Apply pre-emergent herbicide when soil at 2 inches reaches 55°F for several consecutive days. This is the threshold where crabgrass and other summer annual weeds begin germinating. Applying after this point reduces effectiveness significantly.

What is a USDA Plant Hardiness Zone?

USDA Plant Hardiness Zones divide the US into 13 zones based on average annual extreme minimum temperature. They help determine which plants and grasses can survive winter in your area. Zone numbers increase from coldest (1a) to warmest (13b).

Grass seed germination

Your soil near Auburn, CA: 78°F at 2 inches, as of July 4, 2026. Modeled estimate.

Grass species	Germination optimum	Days	Right now
Bermudagrass	75–85°F	10-30	Germinates well
Zoysia	75–85°F	varies	Germinates well
Buffalograss	75–85°F	14-30	Germinates well
Centipede	75–85°F	varies	Germinates well
Kentucky bluegrass	59–86°F	14-30	Germinates, but warm for establishment

See all species and the full germination guide →

This week’s watering for Auburn, CA

Water about 1.25 inches this week

Weekly target	1.25 in	at 78°F soil, for warm-season grass
Expected rain	0 in	over the next 7 days
You supply	1.25 in	in 2 deep sessions, watered 4-9 AM

The weekly target includes rainfall, so irrigation only covers the deficit. Water deeply and infrequently rather than a little every day: shallow daily watering builds shallow roots and invites disease. Rainfall is a modeled forecast estimate for this location.

How to water by soil temperature, and audit your sprinklers →

Lawn disease risk

The 7-day forecast near Auburn, CA favors watch-level conditions. These diseases are the ones to watch now. Based on a modeled weather estimate for this location.

Disease	Risk	Why now
Pythium blight (Pythium spp.)	Watch	3 of the next 7 nights stay above 65°F with hot days; worse with excess nitrogen. Water early morning to limit leaf wetness, hold nitrogen to 0.25 lb/1,000 sq ft, and fix drainage in low spots. The fastest killer, 2-3 days.

How temperature drives lawn disease, and the cultural fixes →