When does pre-emergent application typically open in San Andreas, CA?

Pre-emergent application typically opens in April to May for San Andreas, 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 San Andreas, CA?

San Andreas, 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 San Andreas, CA?

In San Andreas, CA, the first fall frost typically arrives around December 17. 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 Yosemite Village 12 W, about 54 miles from San Andreas. 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 San Andreas come from?

Soil temperature for San Andreas comes from Yosemite Village 12 W, a station in the NOAA US Climate Reference Network (USCRN) located about 54 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.

Lawn Care Schedule for San Andreas, CA

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Right now in San Andreas

70°F at 2-inch depth · Measured in the ground · Yosemite Village 12 W (NOAA USCRN #53150), 54 mi SE · read 2 days ago (Sep 11, 2026) · updates nightly with about a 1-day sensor lag

Fall pre-emergent (Poa annua)IN WINDOW

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Weed

IN WINDOW

Prodiamine pre-emergent

Fall pre-emergent (Poa annua)

Annual bluegrass (Poa annua) germinates in cool, moist soil in early fall and overwinters as a dense, light-green pest in dormant warm-season turf. A fall pre-emergent stops the seed before it ever sprouts; once the plants are visible in winter, control gets much harder.

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Prodiamine: Prodiamine (Barricade)
Dithiopyr: Dithiopyr granules (Hi-Yield)
Pendimethalin: Scotts Halts (pendimethalin)

Shallow soil temperatures are in the action band at 69.8°F at the Yosemite Village 12 W sensor, 54 miles from your location.

Window: Sep 1 to Oct 31. Window typically open for 2 to 3 weeks.

Why this, why now

[11] NC State Extension TurfFiles: Annual Bluegrass (2022)
(2024)

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About this schedule

Soil at 2 inches is currently 70°F. Fall pre-emergent (Poa annua) is in window now. That is 6°F above the 30-year normal for this date. Data from NOAA US Climate Reference Network (USCRN), 54 miles away at Yosemite Village 12 W.

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)
: Crabgrass (2023)