When Should You Winterize Your Sprinklers in Northern Colorado?

Colorado's Front Range is known for unpredictable weather — sunny and 70 one day, snowing the next. That makes timing your sprinkler winterization critical.

The Short Answer

In Northern Colorado, you should winterize your irrigation system between **mid-October and early November**. Ideally, get it done before the first hard freeze (when temperatures drop below 28°F for several hours).

Why Timing Matters

Water left in your irrigation lines can freeze and expand, cracking pipes, breaking valves, and damaging sprinkler heads. A proper blowout removes all water from the system using compressed air.

What's Involved

Professional winterization includes: - Shutting off the water supply to the irrigation system - Blowing compressed air through each zone - Draining the backflow preventer - Shutting down and backing up your controller settings

Don't Wait Too Long

Every year we get calls from homeowners who waited too long and ended up with cracked pipes. The repair bill is always more expensive than the winterization would have been.

Schedule Your Winterization

Contact Trailhead Lawn & Irrigation to get on our winterization schedule. We serve Weld County, Erie, and Longmont.