How Often Should You Water Your Yard in Phoenix? A Season-by-Season Guide

Quick answer

Watering in Phoenix depends on plant type, age and season. Water deeply and less often, put trees, shrubs and lawn on separate valves, and adjust the controller at least four times a year. Established desert plants need far less than most people give them, summer needs the most water, and dormant Bermuda needs very little in winter. AMWUA's Landscape Watering by the Numbers guide has Phoenix-specific schedules.

Last updated October 22, 2026

Water is the biggest variable in a Phoenix-area landscape. Outdoor watering is commonly the largest part of a household's water use, and most plant problems here trace back to watering: too often and too shallow, or set once and never changed. The good news is that a few principles and a seasonal routine go a long way. This guide covers how to think about watering lawns, trees, shrubs and desert plants through the year.

Principle 1: Deep and infrequent

Roots grow where water is. Short, daily watering keeps moisture near the surface, so roots stay shallow and plants wilt the moment a hot afternoon hits. Watering less often but longer pushes water down into the root zone and encourages deeper roots. As general guidance used in the Phoenix area, water for trees should soak down roughly two to three feet, shrubs about two feet, and groundcovers, perennials and lawn about one foot. You can check depth by pushing a long screwdriver or soil probe into the ground after watering; it slides easily through moist soil and stops where the soil is dry.

Principle 2: Water by plant type

A tree, a shrub, a cactus and a lawn have completely different needs. When they share one valve, something is always over or under watered. A good system separates:

Trees, which need the most water per watering but less often, spread across a wide area.
Shrubs and groundcovers on drip.
Cacti and succulents, which need little once established and can rot if overwatered.
Lawn, on sprays or rotors.

As trees grow, their roots spread well past the trunk. Emitters huddled at the base of a mature tree don't reach most of its roots. Move emitters outward or add more as the canopy expands.

Principle 3: New plants need more

Even the toughest desert plant needs regular water while it establishes, often for its first year or longer for trees. Established desert-adapted plants, by contrast, can often get by on rainfall with occasional supplemental water during long dry periods. Many yards keep watering mature desert plants like new ones, which wastes water and can shorten their lives.

Spring (March to May)

Temperatures climb fast and rain is scarce, so water needs rise each month. This is when Bermuda wakes up. University of Arizona Extension's low-desert turf guide suggests starting light fertilizer on Bermuda in April once soil temperatures stay near 60 degrees. Overseeded ryegrass is still green early in spring and fades as heat arrives. Lowering the mowing height on ryegrass helps the Bermuda come back. Check your system for winter damage, clogged emitters and tilted heads before the heat comes.

Early summer (June)

June is usually the hottest, driest stretch before the monsoon. Plants work hardest now. Increase how often you water, not just how long, because the soil dries quicker in heat. Extension's turf guide describes watering Bermuda lawns about every few days in summer to build deeper roots rather than every day. Water early in the morning so less is lost to evaporation and wind. Watch new plantings closely.

Monsoon season (roughly mid-June through September)

Monsoon storms are hit or miss. One neighborhood can get a soaking while the next stays dry. Turn off or reduce irrigation after a real soaking rain, and turn it back on when the soil dries. A rain sensor or a weather-based smart controller does this automatically. Humidity also lowers plant water needs a little compared with the dry heat of June. Monsoon winds are hard on shallow-rooted trees, another reason for deep watering.

Fall (October and November)

As temperatures fall, cut back watering frequency. This is the main planting season for many desert plants, so new plantings will need regular attention. If you overseed, University of Arizona Extension suggests about October 10 to November 10 in the Phoenix area. Germinating ryegrass needs light, frequent watering, sometimes several times a day, for the first couple of weeks. That's a significant amount of water, which is one reason many homeowners now skip overseeding.

Winter (December to February)

Most plants need much less water now. Overseeded winter lawns still need regular water; Extension's guide gives a range of about half an inch to an inch and a half per week for winter turf, depending on conditions. Non-overseeded dormant Bermuda generally needs little or no water. Extension suggests a monthly watering in December through February if winter rains are lacking. Watch for frost on cold nights; protect tender plants and exposed pipes and backflow devices.

Setting the controller

Adjust at least four times a year. A controller set for June and left alone wastes enormous amounts of water in winter.
Use cycle and soak on lawns. If water runs onto the sidewalk before the time is up, split the run into shorter cycles with breaks.
Consider a smart controller. EPA's WaterSense program labels controllers that meet its efficiency criteria, and some Valley water providers offer rebates or programs.
Get monthly reminders. The Arizona Municipal Water Users Association offers a monthly text reminder linked to the current watering schedule in its Landscape Watering by the Numbers guide.

Signs you are watering wrong

Overwatering: yellowing leaves, soggy soil, algae on rock, mushrooms, rotting cacti, and roots of trees heaving walks.
Underwatering: wilting that doesn't recover overnight, crispy leaf edges, and early leaf drop.
Leaks: one constantly wet spot, a water bill jump, or a valve that won't shut off.

City rules and shortages

Phoenix-area cities generally publish watering guidelines and run conservation programs, and rules can tighten during water shortages. HOAs may add their own requirements. Check with your water provider for current rules. Many providers also offer free or low-cost water checkups and workshops.

When to call a pro

If zones don't match plant types, emitters are missing or clogged, valves leak, or the controller is a mystery, an irrigation company can re-zone, convert sprays to drip and set a schedule. In Arizona, residential irrigation contractors are licensed by the Registrar of Contractors under the R-21 classification. Request an irrigation company, or read more about irrigation in the Phoenix area.

Frequently asked questions

How long should I run drip irrigation in Phoenix?

It depends on emitter output, plant type, age and season. The goal is to wet the root zone deeply, which you can check with a soil probe. AMWUA's Landscape Watering by the Numbers guide has Phoenix-area recommendations.

Should I water during monsoon season?

Reduce or pause irrigation after a soaking rain and resume when the soil dries. Storms are spotty, so base it on what fell in your yard, or use a rain sensor or smart controller.

Does dormant Bermuda need water in winter?

Very little. University of Arizona Extension suggests about a monthly watering from December through February if winter rains are lacking.

Sources and further reading

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