Schedule sprinkler winterization before a hard freeze can damage irrigation lines and backflow equipment. In Castle Rock, many homeowners book in early fall rather than waiting for the first forecasted freeze. The best date depends on the weather and your system.
Why winterization matters here
Water trapped in irrigation pipes, valves, and sprinkler heads expands as it freezes. Freeze damage may not become obvious until the spring startup.
Colorado State University Extension recommends clearing water from the system and cautions against relying on automatic or manual drain valves alone.
When should you schedule?
Plan ahead in September or early October, and adjust based on current forecasts. A first overnight frost does not affect every underground component equally, but exposed backflow components are more vulnerable.
Do not treat one published first-freeze forecast as a guaranteed annual date. If freezing weather arrives before your appointment, ask your irrigation professional how to protect exposed equipment safely.
What should a professional blowout include?
Ask whether the price includes all zones, backflow assembly preparation, controller settings, and verification that the system is properly shut down for winter.
Confirm how additional zones are billed and whether the technician is familiar with your backflow device. CSU warns that compressed air must not be blown through certain backflow preventers.
Can homeowners do it themselves?
Compressed air can injure people or damage equipment when used improperly. Correct connection points, pressure, compressor sizing, and backflow handling matter. If you have not winterized that exact system before, hiring a qualified professional is generally the safer approach.
What about next spring?
Keep a record of any repairs noted during the blowout. When temperatures warm, schedule a slow, controlled startup and inspect every zone for winter damage.
Sources & verification
These links support the local rules, published prices, or technical guidance discussed above. Service fees and regulations may change.