How to Set Your Sprinkler Timer by Season in SoCal

The single most common irrigation mistake is leaving the sprinkler timer on one schedule all year. Your yard's water needs change dramatically between a January cool spell and a July heat wave. Here's how to set your sprinkler timer by season in Southern California.

Water by the season, not the calendar

Adjust runtimes and frequency as conditions change. As a general framework for the Inland Empire:

• Summer: the most water — warm-season lawns and plants need frequent, deep watering.
• Spring/Fall: moderate — cut back as temperatures ease.
• Winter: minimal or off — cool weather and rain do much of the work.

Water early in the morning

Schedule watering for the pre-dawn hours (roughly 4–8 a.m.). This minimizes evaporation, avoids wind, and lets foliage dry to prevent disease. Never water midday in summer — much of it evaporates — or at night, which invites fungus.

Use cycle-and-soak on clay

Inland Empire clay can't absorb water fast, so a single long runtime runs off and wastes water. Instead, split the runtime into two or three shorter cycles a few minutes apart so water soaks in. Many controllers have a built-in 'cycle and soak' or 'soak' feature.

Follow local restrictions

Most Southern California water districts set allowed watering days and times. Build your schedule around them — or let a smart controller handle the adjustments automatically. Our water management team can program your system.

Frequently asked questions

What time should sprinklers run in SoCal?

Early morning, roughly 4–8 a.m., to minimize evaporation and let grass dry before evening.

How often should I change my sprinkler schedule?

At least seasonally — or use a smart controller that adjusts automatically to weather and temperature.

Arbol Roble has cared for Inland Empire landscapes since 1997, serving Rancho Cucamonga, Ontario, Fontana, Eastvale, Corona and Riverside. Request a free quote or browse our residential and commercial services.