Author: Dianne DeLongchamps
Drought guidance verified as of August 2026. Provider requests change. Check yours before you set your timer.
- How much water does a Colorado lawn need per week?
- Do the 2026 drought rules change how much I should water?
- How often should I water my lawn in Colorado?
- How deep should I water my lawn?
- How do I measure how much water my sprinklers put down?
- How do I know if I'm overwatering my lawn?
- How should watering change through the season?
- Does healthier soil help a lawn use less water?
- FAQ
How much water does a Colorado lawn need per week?
Luke’s number for our customers is 1 to 2 inches per week, with 2 inches through the real heat, roughly mid-July to mid-August, applied across two to three deep waterings rather than daily sprinkling. That’s the figure he gives on site visits across Fort Collins, Windsor, and Timnath.
That number comes off Clean Air Lawn Care routes, not a national calendar. Nearly every lawn we treat in those three towns is turf-type tall fescue or Kentucky bluegrass in compacted Front Range clay. Our organic program is a soil program, non-toxic organic fertilizers and organic soil builders, aimed at how much of what you apply the soil can hold. Luke pairs the watering number with a mowing standard of 3 inches minimum, 3.5 in July and August, so less evaporates before roots get it. Stay off a freshly treated lawn two to four hours or until it’s dry, whichever comes later.
CSU Extension publishes several figures, and they don’t all match:
| CSU source | Peak summer figure |
| CMG GardenNotes #265 / Turfgrass Management | 1.5 in/week in July and August (0.75″ late Apr–May · 1.0″ June · 1.5″ July–Aug · 1.0″ Sept · 0.75″ Oct) |
| CSU Fact Sheet 7.202 | A healthy, high-quality bluegrass or ryegrass lawn may need up to 2.25 inches of water per week under hot, dry, windy summer conditions. |
| CSU Fact Sheet 7.199 | Kentucky bluegrass lawns may require 2.5 inches of water or more per week during the heat of summer. |
Our range sits inside that spread, above CSU’s scheduling table at the peak, below both ceilings. The mid-July-to-mid-August timing is our own read from working these lawns, and CSU’s seasonal table peaks in July and August too.
Note the qualifiers: “high-quality bluegrass or ryegrass” under “hot, dry, windy” conditions. Those are ceilings for a specific lawn, not weekly targets.
Do the 2026 drought rules change how much I should water?
Fort Collins Utilities’ current voluntary guidance targets about 1 inch per week across two watering days, under the Water Shortage Watch declared May 1, 2026. Fort Collins–Loveland Water District asks for two days a week as well.
We think you should honor it. So how do you keep a lawn alive on the low end? Not with more water, but with deeper water, a taller cut, and soil that can hold what you give it. Here is the full 2026 drought coverage for Northern Colorado.
How often should I water my lawn in Colorado?
CMG GardenNotes #265: “For most Colorado soils, irrigating once per week works in the spring and fall, and twice a week works in the summer.”
CSU’s necrotic ring spot guidance goes further, recommending watering “as infrequently as possible, typically no more than twice weekly”, and NRS is what CSU calls “the most common lawn problem in Colorado.”
CSU 7.199 gives the trigger: “Do not irrigate again until you see signs of wilt. It’s important that the soil profile dries somewhat between irrigation applications.”
Daily light watering keeps moisture at the surface, so roots stay there. Deep cycles push water down and roots follow.
Luke recommends two to three waterings a week in summer, CSU’s twice as the floor, plus a third day when heat, wind, or a sandy spot calls for it. The weekly total shouldn’t move. A third day splits the same inch or two across three runs.
How deep should I water my lawn?
TTotal inches per week is a proxy. CSU recommends watering to root depth:
- Clay soil: Apply 1 to 1 1/2 inches of water to moisten the root zone to a 6-inch depth.
- Sandy soil: It can be moistened to 6 inches by as little as 1/2 inch of water.
- Find out which you have: Use a soil probe or shovel to determine what the average rooting depth is in your lawn.
Much of the Front Range is clay, so a full application is on the higher end. Water runs off if you apply it faster than the soil takes it. If you see runoff, split the cycle.
How do I measure how much water my sprinklers put down?
Almost nobody knows their sprinkler output. CSU’s audit method:
- Place 5 to 10 identical straight-sided containers around the zone
- Run the system 15 to 20 minutes
- Measure the depth in each with a ruler, to 1/10 inch if you can
- Convert to run times – CMG GardenNotes #266, Converting Inches to Minutes, does exactly this
A note on containers: CSU’s audit tutorial lists tuna or cat food cans, while CSU’s GardenNotes #265 warns “Do not use short cans like tuna cans as they are too shallow, and water may splash out.” Use taller containers, plastic cups or a rain gauge.
How do I know if I’m overwatering my lawn?
CSU’s field test, from GardenNotes #265: “In unusually hot weather, if dry spots do not pop up, the lawn is over-watered.” A lawn that never shows a dry spot through an August heat wave is getting more than it needs.
For scale: Denver Water reports that “many customers in Denver Water’s service area use 18 gallons per square foot or more to water bluegrass lawns” when “experts say only 12 gallons per square foot is required to keep the grass lush and healthy.” Different utility, same pattern.
Other signs: spongy soil, visible runoff, and thatch buildup.
How should watering change through the season?
CSU expresses the seasonal shift mainly as frequency, once a week in spring and fall, twice a week in summer. The GardenNotes seasonal table gives depth too: about 0.75 inch late April through May, 1 inch in June, 1.5 inches July–August, 1 inch in September, 0.75 inch in October.
The most common mistake we see isn’t summer settings. It’s leaving June settings running into October.
Does healthier soil help a lawn use less water?
The healthier the soil, the more of what you apply reaches roots and stays there. Compacted clay sheds water. CSU calls compaction “the primary factor limiting plant growth in landscape soils” and recommends aerating at least once a year. Aeration and organic matter improve infiltration, so the water you’re already paying for works harder.
Getting the watering right is the cheapest lawn improvement there is, and most Front Range yards are watering more often and less deeply than they should. Luke’s two numbers, the ones he gives at every estimate: 1 to 2 inches a week with 2 through the mid-July to mid-August heat, and a mower set at 3 to 3.5 inches so less of it evaporates before the roots get it. If you want us to look at your sprinkler setup and tell you what you’re actually applying, that’s a conversation we’re glad to have.
Clean Air Lawn Care Northern Colorado is owned by Dianne, Paul, and Luke DeLongchamps — a family business serving Fort Collins, Windsor, and Timnath with organic lawn treatments and solar-powered electric equipment.
