When does pre-emergent application typically open in Aliso Viejo, CA?

Pre-emergent application typically opens in April to May for Aliso Viejo, 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 Aliso Viejo, CA?

Aliso Viejo, CA is a transition zone where both cool-season and warm-season grasses are common. Warm-season grasses (Bermuda, Zoysia, St. Augustine, Centipede, Bahia) thrive once 2-inch soil sits in the 65–90°F range and go dormant brown over winter. 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 Aliso Viejo, CA?

Aliso Viejo, CA sees little to no typical fall frost in most years. Cool-season tasks anchored to a frost date use a calendar-fallback window instead. 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 Fallbrook 5 NE, about 31 miles from Aliso Viejo. 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 warm-season grasses need to germinate?

Seeded warm-season grasses like Bermuda and Zoysia germinate best when 2-inch soil temperature sits in the 65–90°F range for several consecutive days; below that range, seed sits dormant or rots. St. Augustine establishes from sod or plugs rather than seed, but takes hold in the same warm-soil window. 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 Aliso Viejo come from?

Soil temperature for Aliso Viejo comes from Fallbrook 5 NE, a station in the NOAA US Climate Reference Network (USCRN) located about 31 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 Aliso Viejo, CA

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Right now in Aliso Viejo

93°F at 2-inch depth · Measured in the ground · Fallbrook 5 NE (NOAA USCRN #53151), 31 mi E · read 2 days ago (Sep 10, 2026) · updates nightly with about a 1-day sensor lag

Warm-season late-summer nitrogenIN WINDOW

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Fertilizer

IN WINDOW

Warm-season late-summer nitrogen

A final nitrogen feeding before the lawn slows in early fall builds carbohydrate reserves the grass uses to overwinter and green up faster next spring. Feeding this late on cool-season grass invites disease, but warm-season turf still has growth to spend it on.

Complete fertilizer: Andersons PGF Complete 16-4-8
Centipede-safe fertilizer: Ferti-Lome centipede 15-0-15

Shallow soil temperatures are in the action band at 92.5°F at the Fallbrook 5 NE sensor, 31 miles from your location.

Window: Aug 1 to Sep 30. Window typically open for 2 to 3 weeks.

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About this schedule

Soil at 2 inches is currently 93°F. Warm-season late-summer nitrogen is in window now. That is 8°F above the 30-year normal for this date. Data from NOAA US Climate Reference Network (USCRN), 31 miles away at Fallbrook 5 NE.

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)
University of Georgia Extension: B978: Weed Control in Home Lawns (2024)
: Managing Weeds in Warm Season Lawns (2024)

Lawn Care Schedule for Aliso Viejo, CA

Right now in Aliso Viejo

Lawn Care Schedule for Aliso Viejo, CA

Right now in Aliso Viejo

September

Warm-season late-summer nitrogen

October

November

December

About this schedule

Sources