Seasonal Irrigation Tune-Up in Glendale, Arizona

AMWUA's advice to adjust an irrigation schedule at least four times a year fits Glendale's calendar neatly. The city's year has four clear turns, and each one asks something different of the system.

Spring, as the heat builds

Spring is the time to catch winter damage and get ready for summer. Walk every zone, raise sunken heads, flush drip lines and filters, and check that new plantings from the cool season have emitters. On downtown lots that take the city's urban flood irrigation, spring is also when deliveries start again. In 2026 the first delivery was on April 6, and the city asked owners to cut the grass, clear objects and keep the irrigation valve reachable beforehand.

Summer and the monsoon

Summer schedules run longest, and the weak spots show. AMWUA suggests watering turf between 1 and 7 a.m. in the warm months. The City of Glendale says pressure can dip from 6 to 8 a.m. across its four pressure zones, so early start times help twice. The monsoon, June 15 to September 30 by the National Weather Service count, brings about half the region's yearly rain. After a big storm, look for heads knocked crooked, drip tubing exposed or washed loose, and grit in nozzles. Clear any rain hold so the system does not stay off for a week after the ground has dried.

Fall, the main reset

When the monsoon ends and nights cool, plants need far less water, and AMWUA says far less is needed in the cooler months. Fall is the time to shorten run times and stretch the days between them, and to check the controller's season setting. It is also the season for planting, so new plants may need their own short schedule while the established ones step back. For downtown lots, the end of the urban irrigation season in late October falls in this same window, and those yards go back to sprinklers or drip alone until spring.

Winter and frost

University of Arizona Cooperative Extension puts the average first frost around the Phoenix area between November 21 and December 12, and advises keeping plants well watered before a cold night, because dry plants suffer more frost damage. Winter run times are the shortest of the year, but the system should not be shut off entirely for plants that still need water. Cool weather slows evaporation, so a soil probe is the best guide to how far the gap between waterings can stretch.

What a Glendale tune-up leaves behind

A tune-up should end with an updated zone map, repairs done or listed, and the new program in writing. On a lot that takes urban flood irrigation, the tune-up should also look at the basins and the delivery valve, since the city asks owners to keep that valve reachable before each delivery. The City of Glendale also offers its water customers a free landscape consultation, seasonal gardening classes and a conservation kit. The tune-up service page describes the visit, the inspection checklist helps between visits, and the after-monsoon guide and winter schedule guide cover the two hardest turns.