The Riverside, CA Lawn Care Calendar: What to Do Every Month

Riverside is not Los Angeles, and it is not Phoenix. The Inland Valley has its own thing — summer highs that push past 100°F for weeks at a stretch, Santa Ana winds that dry everything out from October through January, and water districts that tell you exactly which days the sprinklers can run. A lawn care calendar written for the Pacific Northwest or the Midwest will steer you wrong here.

This is the calendar we actually run for our Riverside clients.

What kind of grass grows in Riverside?

Bermuda grass is the standard. It handles triple-digit heat without flinching, recovers fast from foot traffic and drought, and uses less water than cool-season alternatives once established. Zoysia and Buffalo grass work if you want something slower-growing. Tall fescue survives in shadier yards but plan on carrying it through summer with heavier irrigation — it thins badly in August. If you are starting from scratch, put in Bermuda.

Winter: December through February

Bermuda is dormant and brown. That is normal — it is not dead. Do not fertilize. Do not aerate. Mow only if needed for appearances, at a higher setting than summer.

If you overseeded in October with annual ryegrass, mow the rye on a 10–14 day cycle at about two inches. Santa Ana events can dry the soil fast even in December, so check moisture before watering and respect your assigned district days.

This season is right for repairing hardscape, flushing irrigation heads, and adjusting sprinkler coverage before growth resumes.

When should I start spring lawn work in Riverside?

Bermuda starts greening up around mid-March, though dormancy can stretch into April in cooler years.

March: Resume mowing once the grass is actively growing. Raise the deck to about one and a half inches for the first few cuts. Inspect every irrigation head — winter settling shifts heads out of alignment more than any other season.

April: Once soil temperature hits 65°F (usually mid-April in Riverside), fertilize with a balanced slow-release nitrogen product. This is also the window for core aeration — the Bermuda fills in holes within two to three weeks when growing aggressively. A light topdress of sharp sand after aeration improves drainage in the clay-heavy Inland Valley soils.

Does my lawn need a different schedule because of water restrictions?

Yes. Western Municipal Water District (WMWD) and Elsinore Valley Municipal Water District (EVMWD) — the two main agencies serving Riverside County — both enforce assigned watering days, time-of-day windows, and a hard prohibition on watering within 48 hours of measurable rain. Build your irrigation schedule around those rules first, then adjust run times to hit roughly one inch per week during the growing season. A smart controller with a rain sensor makes compliance automatic.

Late Spring through Summer: May through September

Growth is fast in May and June. You will be mowing every week, sometimes every five days. Drop the deck to three-quarters of an inch for Bermuda — low and tight is how it performs best. Keep blades sharp; dull blades shred tips and turn the lawn a stressed tan.

Fertilize again in late May or early June. Watch for grubs in late spring — irregular dead patches that lift like a rug are a grub problem, not a watering problem.

July and August are the hardest months. Water deeply and infrequently: one inch per week in two sessions, not daily shallow sprinkles. Hold fertilizer to once every six to eight weeks maximum.

September temperatures start dropping in the evenings and the lawn responds — you will see stronger color and faster recovery from summer stress.

How do I handle the fall transition and overseeding in Riverside?

October: Cut fertilizer completely by mid-October. This is also overseeding season if you want green through winter. Rake or verticut the Bermuda lightly, broadcast annual ryegrass at roughly ten pounds per thousand square feet, topdress with a thin layer of compost, and water lightly every day for two weeks until germination. The rye will carry color through to April when the Bermuda pushes it out naturally.

Santa Ana season is here. Check soil moisture during wind events — a three-day Santa Ana can drop soil moisture fast enough to stress even dormant grass.

November: Mow the rye at two inches. Let the Bermuda fully go dormant. Hard frosts in Riverside proper are rare, but check irrigation systems if a cold snap is forecast.

If you would rather hand the whole calendar off to a crew that knows Inland Valley conditions, call us at (840) 266-2920. We handle everything from the spring aeration to the fall overseed.