When does pre-emergent application typically open in Grass Valley, CA?

Pre-emergent application typically opens in April to May for Grass Valley, CA, when 2-inch soil temperature reaches the 50–55°F threshold for several consecutive days. Apply earlier than that and the herbicide degrades before crabgrass germinates; apply later and weeds have already sprouted. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

What grass types grow best in Grass Valley, CA?

Grass Valley, CA is primarily a cool-season climate. Cool-season grasses (tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue) thrive when 2-inch soil sits in the 50–65°F range and slow down in midsummer heat. Picking a grass family that matches the climate is the single biggest lawn-care decision; transition-zone homeowners often maintain blends and accept that neither family will look perfect year-round. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

When is the first fall frost typically expected in Grass Valley, CA?

In Grass Valley, CA, the first fall frost typically arrives around November 20. Soil temperature continues to drop through October and November, which closes the fall fertilizer window for warm-season grasses and opens the dormant-seeding window for cool-season grasses. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

How often is this schedule updated?

Recommendations recompute every 6 hours from the latest reading at Eagle Lake, about 99 miles from Grass Valley. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

What soil temperature do cool-season grasses need to germinate?

Cool-season grasses like fescue, Kentucky bluegrass, and perennial ryegrass germinate best when 2-inch soil temperature sits in the 50–65°F range for several consecutive days. Above that, summer heat stresses young seedlings; below that, germination slows or stalls. The re-entry interval (REI) on any post-emergent products you apply during establishment is on the product label; respect it before letting pets or children back on treated areas. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

Where does the soil temperature data for Grass Valley come from?

Soil temperature for Grass Valley comes from Eagle Lake, a station in the USDA Soil Climate Analysis Network (SCAN) located about 99 miles away. Daily readings at depths from 2 inches down to 40 inches feed the schedule's window-open and window-closing decisions. This is informational guidance only, not a prescription. The label is the law. Consult your local Cooperative Extension office before applying any product.

Home Locations Guides

Tools

Live Soil Temperature Map Soil Moisture MapLawn-Care Schedule4-Inch Soil Temperature Soil Temperature by Depth Growing Degree Days

Home Locations Guides Tools

Live Soil Temperature Map Soil Moisture MapLawn-Care Schedule4-Inch Soil Temperature Soil Temperature by Depth Growing Degree Days

Home
California
Grass Valley, CA
Lawn Care Schedule

Lawn Care Schedule for Grass Valley, CA

See another city's schedule →

Right now in Grass Valley

68°F at 2-inch depth · Measured in the ground · Eagle Lake (USDA SCAN #2192), 99 mi N · read 2 days ago (Sep 10, 2026) · updates nightly with about a 1-day sensor lag

Loading lawn care schedule

Data provided by USDA NRCS SCAN Network and NOAA USCRN. Modeled fallback: modeled estimates when a current station reading is unavailable. Updated daily. For official agricultural data, visit nrcs.usda.gov (opens in new tab).

Tools Live Soil Temperature Map Soil Moisture MapLawn-Care Schedule4-Inch Soil Temperature Soil Temperature by Depth Growing Degree Days Locations Stations Guides Methodology About

Home
California
Grass Valley, CA
Lawn Care Schedule

Lawn Care Schedule for Grass Valley, CA

See another city's schedule →

Right now in Grass Valley

68°F at 2-inch depth · Measured in the ground · Eagle Lake (USDA SCAN #2192), 99 mi N · read 2 days ago (Sep 10, 2026) · updates nightly with about a 1-day sensor lag

ℹ

Check your local rules

Marin and Sonoma counties restrict pesticide application on public and some private parcels beyond state law. Source
California drought-emergency declarations trigger watering-day restrictions enforced by local water suppliers; check your provider for current stage. Source
California requires independent product registration via the Department of Pesticide Regulation; some EPA-registered products are not legal for sale or use in CA. Source

September

2026This month

October

2026Coming up

November

2026

No active tasks for your location.

December

2026

No active tasks for your location.

About this schedule

Soil at 2 inches is currently 68°F. That is 6°F above the 30-year normal for this date. Data from USDA Soil Climate Analysis Network (SCAN), 99 miles away at Eagle Lake. First fall frost typically arrives around November 20.

More for Grass Valley, CA

Soil temperature for this area

Soil temperature in Grass Valley, CA

Nearby schedules

Auburn, CA
Rocklin, CA
Yuba City, CA
Roseville, CA
Folsom, CA
Citrus Heights, CA
Oroville, CA
Carmichael, CA

Related guides

Affordable lawn renovation: a new homeowner's guide
When to apply pre-emergent herbicide
Fall pre-emergent timing for poa annua
Winterizer timing: when to stop fertilizing
When to apply broadleaf weed killer (cool-season lawns)
When to apply broadleaf weed killer (warm-season lawns)
Spring overseeding for cool-season grass
Spring lawn fertilization timing

Sources

Penn State Extension: Managing Thatch in Lawns (2025)
NC State Extension: Carolina Lawns: A Guide to Maintaining Quality Turf in the Landscape (2021)
Penn State Extension: Liming Turfgrass Areas (2002)
Virginia Cooperative Extension (Virginia Tech): Fall Lawn Care (2025)
Penn State Extension: Control of Summer Annual Grass Weeds in Turfgrasses (2024)
University of Maryland Extension: Crabgrass (2023)
Penn State Extension: Turfgrass Fertilization: A Basic Guide for Professional Turfgrass Managers (2016)
University of Georgia Extension: Turfgrass Fertility: Understanding Fertilizer Labels, Macronutrients, and Micronutrients (2016)
Penn State Extension: White Grubs in Home Lawns (2024)
Purdue Extension Entomology: Managing White Grubs in Turfgrass (2023)
NC State Extension TurfFiles: Annual Bluegrass (2022)
University of Georgia Extension: Annual Bluegrass Control in Residential Turfgrass (2024)
Penn State Extension: Soil Testing (2026)
University of Maryland Extension: Soil Testing and Soil Testing Labs (2026)

Latest soil reading: Sep 10, 2026 (2 days ago).

Schedule last updated: 14:26 UTC-8

COMING UP

Fall lime application

DAYS

Opens when 2-inch soil holds at or below 60°F. Currently 68°F.

Calendar window date; soil conditions decide the actual open.

→ See full schedule for the year