Author: Dianne DeLongchamps
What’s the best time of day to water my lawn?
Late evening or early morning is the best time of day to water your lawn in Colorado. CSU Extension puts the most efficient windows at 10 p.m. to midnight or 8 to 9 a.m. It’s usually cooler, calmer and more humid then, so less water evaporates, and water pressure is usually better, which helps sprinklers spread water evenly.
Why mornings beat the middle of the day
Between mid-morning and early evening, the sun and wind are strongest. A lot of sprinkler water evaporates before it ever soaks into the ground. That’s also the time of day most Northern Colorado water providers restrict watering, for the same reason. Water earlier in the day, while it’s cooler and calmer, and more of it reaches the soil instead of blowing or evaporating away
Best Watering Windows
- Late Night/Early Morning: CSU Extension recommends watering between 10 p.m. and midnight or 8 to 9 a.m.
- Better Conditions: Temperatures are cooler, winds are calmer, and humidity is higher during these hours.
- Less Evaporation: Cooler air means less water evaporates before reaching the soil.
- Stronger Pressure: Municipal water pressure is often higher, helping sprinklers spread water evenly.
What about watering in the evening or at night?
Late evening is one of your best options when it comes to watering your lawn. CSU Extension’s lawn care guidance lists 10 p.m. to midnight as one of the most efficient times to water. It also says watering at night does not encourage lawn disease, even though many people believe it does.
Automatic sprinkler systems
An automatic sprinkler system makes it easy to lock in these optimal windows; simply program your controller to run during the late evening or early morning hours to maximize water efficiency, and consider using a “cycle and soak” setting to prevent runoff and ensure every drop deeply penetrates Colorado’s heavy soils.
This “cycle and soak” method splits your watering time into shorter intervals with breaks in between. This pause gives Colorado’s dense clay soils adequate time to absorb the moisture completely. Implementing this technique alongside your scheduled evening or morning windows prevents wasteful surface pooling, stops erosion, and ensures moisture reaches the deepest roots where it is needed most.
Does this line up with local watering restrictions?
Usually, yes. Most Northern Colorado lawn watering schedules already steer people away from watering in the middle of the day, for the same evaporation reasons. Following the best-time-of-day advice and following your city’s watering-day rules usually point to the same window. Check out this reource to understnd how much water per week your lawn should be getting.
How to make the most of your watering window
How often you water matters just as much as when. Our field standard for the tall fescue and Kentucky bluegrass common in Fort Collins, Windsor, and Timnath yards is 1 to 2 inches of water a week, moving up to 2 inches from mid-July to mid-August. Spread that across two to three deep waterings instead of a light daily sprinkle. Deep watering pushes moisture further into the soil, so roots grow down to reach it. That builds a stronger lawn than one trained on shallow daily watering.
The CSU Extension Lawn Care Basics guide provides foundational instructions on turfgrass management, including mowing, irrigation, and soil care. Dr. Tony Koski significantly shaped Colorado’s turf and soil programs through 37 years of research in water management, soil nutrients, and practical turf education.
Moving your sprinkler timer earlier in the day can make a real difference in how your lawn handles a Colorado summer. It’s the kind of small fix our family loves helping people find. If your lawn is struggling even with regular watering, we’re happy to take a look.
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.
