How to Use Less Water and Keep Your Lawn Green in Denver
Simple changes that cut waste and help your grass stay healthy with less water
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Water bills and dry summers go hand in hand in the Front Range. The good news: you can often use less water and still have a green lawn. It comes down to when you run the sprinklers, how you mow, and whether your soil can actually hold the water you give it. Here are practical steps that work for yards in Denver, Lakewood, Aurora, and the rest of the metro.
Water in the Early Morning
Running your sprinkler system when the sun is low and the air is cool means less water lost to evaporation and wind. Most of the water reaches the soil and the roots instead of drying off the leaves. Early morning (for example, between 4 and 8 a.m.) is ideal. Watering in the evening can leave the grass wet overnight and increase the chance of disease. Watering in the middle of the day wastes a lot of water to evaporation, especially in our dry, sunny climate. Setting your controller for an early start is one of the easiest ways to use less water and get better results.
Run Zones Long Enough, But Not Too Often
Many people run their sprinklers too often for too short a time. That keeps the surface damp and encourages shallow roots. Instead, water less often and long enough so the moisture soaks down several inches. That encourages deeper roots, which need less frequent watering and handle dry spells better. A common approach in the Denver area is to run each zone two or three times per week (depending on heat and soil) and run it long enough that the water reaches the root zone. You can check by pushing a screwdriver into the soil after watering; if it goes in easily several inches deep, you are in the right range. A sprinkler maintenance check can confirm that every head is working and that you are not wasting water on broken lines or misaimed spray.
Fix Leaks and Broken Heads
A single broken sprinkler head or a leak in the line can waste a large amount of water every time the system runs. Water that sprays onto the sidewalk, driveway, or street is not helping your lawn and still shows up on your bill. Walk the yard periodically and look for heads that are broken, tilted, or spraying the wrong way. Puddles or soggy spots when the system is off can point to a leak. Getting repairs done quickly saves water and keeps the rest of the lawn from being under watered because one zone is leaking. A sprinkler repair visit can find and fix these issues so your system runs efficiently.
Let the Grass Grow a Bit Taller
Mowing height has a big effect on how much water your lawn needs. Taller grass shades the soil, so it holds moisture longer and loses less to evaporation. The roots also tend to grow deeper when the grass is not cut too short. For many lawns in the Front Range, a cutting height of about three inches works well. That might mean raising your mower blade and mowing a bit less often. Avoid cutting more than about one third of the grass blade in a single mowing; taking too much at once stresses the plant and can make it need more water. In Littleton, Centennial, and Highlands Ranch, homeowners who raise their mower height often notice the lawn stays greener with the same or less water.
Improve the Soil So It Holds Water
Colorado soil is often heavy clay. When it gets compacted, water runs off or sits on the surface instead of soaking in. That means you have to water more to get enough down to the roots, and a lot of that water never gets used. Core aeration pulls small plugs of soil out so air, water, and nutrients can reach the roots. Over time, the soil holds water better and the grass develops a deeper root system. Many Denver area lawns benefit from aeration once a year or every other year, often in spring or fall. Combined with a good fertilization schedule, aeration helps the lawn use the water you give it instead of wasting it on runoff.
Adjust for the Season
Grass needs more water when it is hot and growing fast, and less when it is cool or dormant. In spring and fall, you can often run the sprinklers less often or for shorter times. In the heat of summer, you may need to run them more often or longer, but still in the early morning and with long enough run times to get water deep. Do not set the controller once and forget it. Changing the schedule a few times per year can save a lot of water and keep the lawn from being over or under watered. Some controllers can adjust for weather; if yours does, use that feature so the system responds to rain and temperature.
Skip Watering When It Rains
It sounds obvious, but a lot of sprinkler systems run on a fixed schedule even after a good rain. If you have a rain sensor or a controller that can skip a cycle when it has rained, use it. If not, turn the system off manually after a storm and turn it back on when the soil starts to dry. That avoids watering already wet soil and can save a lot of water over the season. In the Denver metro, summer storms can be spotty; one neighborhood gets an inch and the next gets nothing. Paying attention to what your yard actually received helps you water only when needed.
Keep the System Tuned Up
A sprinkler maintenance program typically includes a spring startup to turn the system on and check every zone, plus follow up checks during the season. That keeps heads aligned, catches leaks early, and ensures the controller is set correctly. When everything is working as it should, you use less water for the same result. For homeowners in Westminster, Arvada, and across the Front Range, a yearly startup and a quick midseason check are often enough to keep the system efficient.
Summary: Small Changes Add Up
- Water early in the morning to cut evaporation.
- Water less often but long enough so moisture reaches the roots.
- Fix leaks and broken heads so water goes on the lawn, not the street.
- Mow at about three inches so the soil stays cooler and holds water better.
- Aerate compacted soil so water soaks in instead of running off.
- Adjust run times with the season and skip watering after rain when you can.
You do not have to do everything at once. Pick one or two steps that fit your yard and your schedule, then add more over time. If you want help with sprinkler setup, repairs, or maintenance, or with lawn care like aeration and fertilization, contact us for a free quote. We serve the full Denver metro and can help you use water wisely while keeping your lawn green.
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