The short answer
Kentucky bluegrass around Aurora usually breaks dormancy in April, once the soil has thawed and the lawn starts growing again. That does not mean the sprinklers should run in mid-April. Aurora Water currently prohibits spray irrigation on residential yards from October 15 through April 30. The first legal spray-irrigation window opens May 1.
In 2026 Aurora is also in a Stage I drought, declared by City Council on April 6. Aurora Water asked customers not to turn irrigation systems on until after May 15. Check the city's drought page before you start, because the stage and the assigned days can change.
How to tell the lawn is ready
Look at the grass, not the date on the calendar.
- A screwdriver should push into thawed soil. If the ground is still frozen or muddy, wait.
- Footprints that stay flattened, instead of springing back, mean the lawn is dry.
- A blue-gray cast, instead of green, is another sign the roots need water.
Water only after you see growth. Watering a fully dormant lawn in March mostly wets compacted clay and does not wake the grass up faster.
Clay soil and altitude
Most Aurora lawns sit on clay at about 5,400 feet. Clay holds water once it is wet, and it sheds water when it is dry. A long single run often puddles or runs into the street before it soaks in.
Use cycle-and-soak: run each zone for a few minutes, wait about an hour, then run it again. Two or three short cycles move water deeper than one long cycle, which is what bluegrass roots need. Deeper and less often beats a light sprinkle every day. Shallow daily watering trains roots to stay at the surface, and those lawns brown first in July.
What Aurora allows right now
These are the rules published by the City of Aurora as of spring 2026. Confirm them before you program a controller, because drought stages change:
- Spray irrigation on residential yards is not allowed from October 15 through April 30. Aurora Water watering times.
- From May through September, non-drip outdoor irrigation is limited to two days a week, with no watering from 10 a.m. to 6 p.m.
- Stage I drought rules are on Aurora's drought page. In 2026 the city also asked residents to wait until after May 15 to start systems.
- Even-numbered and odd-numbered addresses are assigned different days. The mailer and the drought page have the current calendar. Do not guess the days from an old photo of a controller.
Centennial and other nearby cities set their own schedules. If your meter is not Aurora Water, follow that utility instead.
Starting the sprinkler system
Before the first cycle, open the system slowly, walk the zones, and look for leaks, tilted heads, and broken pipes from the winter. A head spraying the sidewalk wastes water and can draw a fine under the current rules. Aurora Water's EyeOnWater tool, linked from the drought page, shows whether a zone is running longer than it should.
We do not start up sprinkler systems in the spring. In the fall, we do offer sprinkler blowouts, done by a trusted irrigation partner: $95 for up to 6 zones, plus $10 per zone after 6. If the lawn itself needs mowing, aeration, or a spring cleanup once watering is underway, you can request a quote for that work.
After the first watering
Mowing season for our routes still starts in late April, when the grass is tall enough to cut, even if irrigation is still off. The first cut should only take the top third of the blade. Once May watering is allowed, keep the height around 3 to 3.5 inches so the soil stays shaded. If the lawn is thin, fall aeration and overseeding do more for density than extra water in July.
Watering questions
Residential spray irrigation is not allowed from October 15 through April 30, so the first legal window is May 1. In the 2026 Stage I drought, Aurora Water asked customers to wait until after May 15. Check the city drought page for the current stage.
During the restricted season, no more than two days a week, and not between 10 a.m. and 6 p.m. from May through September. Water deeply with cycle-and-soak so clay actually absorbs it.
Dry clay resists water. Short cycles with a soak in between let it infiltrate. Runoff into the street is also something Aurora Water enforces against.
No. We mow, aerate, overseed, fertilize, and clean up lawns, so have your irrigation system started and checked before the first cycle. In the fall we do offer sprinkler blowouts through a trusted irrigation partner, $95 for up to 6 zones plus $10 per zone after 6.