If you’ve been outside in Denver lately, you may wonder:
“Is it time to turn on my sprinklers yet?”
With sunny 60 to 70 degree days followed by surprise snow and overnight freezes, 2026 is already proving to be a classic Colorado spring. It can be tempting to get your lawn going early, but starting your sprinkler system too soon puts your system at significant risk of costly damage.
Here’s what homeowners need to know this year.
Timing Matters More Than Ever in 2026
In Denver, the biggest risk isn’t cold days; it’s the overnight freeze.
Even after a stretch of warm weather, temperatures can still dip below freezing well into spring. Turning on your system too early can lead to cracked pipes, broken sprinkler heads, or damage to the backflow preventer.
Historically, it is safest to wait until early May, once the higher risk of freeze has passed.
In a year like this one with unpredictable weather swings, it is even more important to watch the forecast, not just the calendar.
Why You Should Not Rush It
We have already seen warm days followed by a cold snap this season.
This is exactly how sprinkler systems get damaged.
Even a single freezing night can freeze water left in exposed components, causing expansion, cracking, and hidden leaks that may not appear for weeks.
Quick Rule of Thumb:
If you are still seeing overnight temps near or below freezing, hold off.
Before You Turn Anything On
Once we are consistently above freezing, do a quick check first.
- Inspect visible components: Look for cracked sprinkler heads or exposed lines. Check for damage from winter conditions.
- Check your backflow preventer: This is the most vulnerable part to freezing. Make sure it is intact and properly sealed.
- Clear debris: Dirt, mulch, and buildup can block proper spray.
When You Are Ready to Start Up
When the timing is right, a proper startup is key to avoiding issues.
- Turn the water on slowly: Opening the valve too quickly can cause pressure damage.
- Run each zone: Make sure heads pop up and rotate correctly.
- Check for uneven coverage.
- Look for leaks: Wet spots, low pressure, or hissing sounds are red flags.
- Adjust your controller: Early-season watering should be lighter and less frequent.
If you need help, Brothers offers professional sprinkler start-up.
Denver Specific Tip for 2026
This spring is shaping up to be another false-start season, with warm spells followed by cold snaps.
- Spot water with a hose if needed
- Wait for consistent overnight temps above freezing
- Plan your full startup closer to May
This approach protects your system and saves you from expensive repairs later.
Want to Skip the Guesswork
Sprinkler systems can be more complex than they look, and timing them wrong can be costly. A professional startup with Brothers ensures every zone is tested, heads are adjusted for proper coverage, and that your system is programmed efficiently.
Any problems are caught early.
Bottom Line
Denver spring weather is unpredictable, especially this year.
- The best move is to be patient
- Watch overnight temps
- Start up your system the right way, at the right time
Your lawn will still thrive, and your sprinkler system will thank you.
Areas We Serve
We proudly provide sprinkler startup and irrigation services across the Denver Metro Area, including.
- Denver
- Aurora
- Lakewood
- Littleton
- Highlands Ranch
- Englewood
- Centennial
- Arvada
- Wheat Ridge
If you are unsure whether you are in our service area, reach out, and we will be happy to help.
Frequently Asked Questions About Sprinkler Startups in Denver
When should I turn on my sprinklers in Denver?
Most homeowners should wait until early May. The key factor is consistent overnight temperatures above freezing, not just warm daytime weather.
What happens if I turn my sprinklers on too early?
Starting too early can lead to frozen pipes, cracked sprinkler heads, and damage to your backflow preventer, all of which can result in costly repairs.
How do I know if my sprinkler system was damaged over winter?
Signs include low water pressure, uneven spray, water pooling in certain areas or zones, or not turning on properly.
Can I turn my sprinkler system on myself?
Yes, you certainly can. If you do, it is important to turn the water on slowly, check each zone, and inspect for leaks or damage. A professional startup ensures everything is working safely and efficiently.
Why is my backflow preventer so important?
The backflow preventer protects your home’s water supply from contamination and is one of the most common components to fail after a freeze.
What is the advantage of a sprinkler start-up each year?
Annual startups by a professional like Brothers help catch small issues early, improve efficiency, and extend the life of your irrigation system.
What is the safest way to water my lawn early in the season?
If your lawn needs water before it is safe to start your system, use a hose for light spot watering instead of turning on the full irrigation system.
