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

Pre-emergent application typically opens in April to June for Pomona, 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 Pomona, CA?

Pomona, 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 above 65–70°F 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 Pomona, CA?

In Pomona, CA, the first fall frost typically arrives around October 22. 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 Fallbrook 5 NE, about 53 miles from Pomona. 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 stays at 65–70°F or higher 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 Pomona come from?

Soil temperature for Pomona comes from Fallbrook 5 NE, a station in the NOAA US Climate Reference Network (USCRN) located about 53 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 Pomona, CA

86°F at 2-inch depth · Fallbrook 5 NE station, 53 mi

No active tasks for your location.

Fertilizer

IN WINDOWMODERATE CONFIDENCE

Warm-season summer nitrogen^{11, 12}

A mid-summer nitrogen feeding sustains the bermudagrass or zoysia growth started in late spring, feeding the most active growth phase of the year. Skipping it leaves a thinner canopy heading into the late-summer disease and weed window.

Shallow soil temperatures are in the action band at 85.6°F at the Fallbrook 5 NE sensor, 53 miles from your location.

Window: Jun 1 to Jul 31. Window typically open for 2 to 3 weeks.

Why this, why now

Safety details (REI, air-temp ceiling, pre-rain)

Re-entry interval is not required for this product.

Air temperatures above 95°F can volatilize the product or stress the lawn. Wait for cooler conditions.

Air temperatures below 65°F slow uptake and reduce efficacy. Wait for warmer conditions.

Apply at least 24 hours before forecast rain so the product binds before runoff.

Fertilizer

IN WINDOWMODERATE CONFIDENCE

Summer iron (foliar) application^{13, 14}

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 85.6°F at the Fallbrook 5 NE sensor, 53 miles from your location.

Window: Jun 1 to Aug 31. Window typically open for 2 to 3 weeks.

Why this, why now

Safety details (REI, air-temp ceiling, pre-rain)

Keep pets and children off treated areas for 4 hours after application.

Air temperatures above 90°F can volatilize the product or stress the lawn. Wait for cooler conditions.

Air temperatures below 60°F slow uptake and reduce efficacy. Wait for warmer conditions.

Apply at least 4 hours before forecast rain so the product binds before runoff.

Cultivation

IN WINDOWMODERATE CONFIDENCE

Spring core aeration (warm-season)^{15, 16}

Bermudagrass, zoysia, and centipede recover fastest from aeration when they are actively growing in late spring. Pulling cores relieves compaction and lets the lateral-spreading rhizomes and stolons fill the open holes within weeks.

Shallow soil temperatures are in the action band at 85.6°F at the Fallbrook 5 NE sensor, 53 miles from your location.

Window: Apr 1 to Jun 30. Window typically open for 2 to 3 weeks.

Why this, why now

Cultivation

IN WINDOWMODERATE CONFIDENCE

Warm-season seeding^{17, 18}

Bermudagrass, zoysia, centipede, and bahia germinate from seed once 2-inch soil temperatures sustain in the 65–90°F band. St. Augustine is established from sod or plugs — its seed is unreliable and not commercially viable. Pair seeding with aeration so seed drops into open holes for ideal soil contact.

Shallow soil temperatures are in the action band at 85.6°F at the Fallbrook 5 NE sensor, 53 miles from your location.

Window: Apr 1 to Jul 31. Window typically open for 2 to 3 weeks.

Why this, why now

Cultivation

IN WINDOWMODERATE CONFIDENCE

Summer mowing-height adjustment (warm-season)^{19, 20}

Warm-season grasses grow most aggressively in summer and benefit from frequent, slightly-higher mowing — typically 1.5-2.5 inches for bermuda, 2-2.5 for zoysia, 3-4 for St. Augustine. Mowing too short scalps the lawn and exposes soil to weed seeds.

Shallow soil temperatures are in the action band at 85.6°F at the Fallbrook 5 NE sensor, 53 miles from your location.

Window: Jun 1 to Aug 31. Window typically open for 2 to 3 weeks.

Why this, why now

No active tasks for your location.

About this schedule

Soil at 2 inches is currently 86°F. Summer iron (foliar) application is in window now. That is 2°F above the 30-year normal for this date. Data from NOAA US Climate Reference Network (USCRN), 53 miles away at Fallbrook 5 NE.

Sources

Penn State Extension: Thatch Management in Lawns (2024)
NC State Extension TurfFiles: Thatch and Dethatching (2023)
Penn State Extension: Managing Soil pH (2024)
Virginia Cooperative Extension (Virginia Tech): Lime, the Real Story (2023)
University of Georgia Extension: B978: Weed Control in Home Lawns (2024)
Clemson Cooperative Extension HGIC: Managing Weeds in Warm Season Lawns (2024)
Penn State Extension: Preemergence Herbicides for Control of Crabgrass in Lawns (2024)
University of Maryland Extension: Crabgrass and Other Summer Annual Grass Weeds in Lawns (2023)
University of Georgia Extension: Lawns in Georgia: Selection and Species (2024)
University of Florida IFAS Extension: Fertilization Recommendations for Warm-Season Lawns (2023)
University of Florida IFAS Extension: Fertilization Recommendations for Warm-Season Lawns (2024)
University of Georgia Extension: Bermudagrass Lawn Calendar (2023)
Penn State Extension: Iron Applications on Cool-Season Turf (2024)
University of Georgia Extension: Iron and Micronutrients in Warm-Season Lawns (2023)
University of Georgia Extension: Aeration of Warm-Season Lawns (2024)
University of Florida IFAS Extension: Warm-Season Turf Cultural Practices (2023)
University of Georgia Extension: Establishing and Managing Bermudagrass Lawns (2024)
University of Florida IFAS Extension: Establishing Your Florida Lawn (2023)
University of Georgia Extension: Mowing Bermudagrass Lawns (2024)
Texas A&M AgriLife Extension: Mowing Heights for Warm-Season Lawns (2023)
Penn State Extension: White Grubs in Home Lawns (2024)
Purdue Extension: Managing White Grubs in Turfgrass (2023)
University of Georgia Extension: Lawns in Georgia: Maintenance Calendar (2024)
NC State Extension TurfFiles: Warm-Season Turf Fertilization (2023)
Penn State Extension: Soil Testing for Lawns and Landscapes (2024)
University of Maryland Extension: Soil Testing for Home Lawns (2023)
NC State Extension TurfFiles: Annual Bluegrass Control in Turfgrass (2024)
University of Georgia Extension: Annual Bluegrass Control in Lawns (2023)
Penn State Extension: Fall Lime Applications (2024)
Virginia Cooperative Extension (Virginia Tech): Lime Application Timing (2023)

Lawn Care Schedule for Pomona, CA

March

April

May

June

Warm-season summer nitrogen^{11, 12}

Summer iron (foliar) application^{13, 14}

Spring core aeration (warm-season)^{15, 16}

Warm-season seeding^{17, 18}

Summer mowing-height adjustment (warm-season)^{19, 20}

July

August

September

October

November

December

About this schedule

Sources

Lawn Care Schedule for Pomona, CA

Warm-season summer nitrogen11, 12

Summer iron (foliar) application13, 14

Spring core aeration (warm-season)15, 16

Warm-season seeding17, 18

Summer mowing-height adjustment (warm-season)19, 20

About this schedule

Sources

Warm-season summer nitrogen^{11, 12}

Summer iron (foliar) application^{13, 14}

Spring core aeration (warm-season)^{15, 16}

Warm-season seeding^{17, 18}

Summer mowing-height adjustment (warm-season)^{19, 20}