Start Only After the Freeze Risk Has Passed
Do not turn an irrigation system back on after one warm weekend. Wait until your local forecast is reliably above freezing and the ground has thawed around valves and backflow equipment. Cold-zone homeowners should use their local extension office or weather service rather than a calendar date.
Before opening the supply, walk the visible system: check the backflow preventer, valve-box lids, exposed pipe, controller wiring, and heads near driveways or snow-plow edges. Take photos of anything cracked before applying pressure.
Spring Start-Up Checklist
What Each Symptom Usually Means
| Symptom | First check | Likely next step |
|---|---|---|
| One head will not rise | Debris around riser | Clean or replace the head |
| Several heads are weak | Zone valve and filter | Check pressure and valve flow |
| Water pools near a head | Broken nozzle or wrong arc | Replace nozzle and adjust arc |
| Controller shows a zone fault | Wire connections | Inspect common wire and solenoid |
| Backflow device drips | Freeze damage or seal issue | Stop and arrange qualified service |
Set a Spring Schedule, Not a Summer Schedule
Spring grass and beds normally need less irrigation than they will in July. Start conservatively, then adjust for rainfall, soil type, sun exposure, and plant type. Do not use a fixed summer timer simply because it worked last year. A weather-aware controller can reduce manual changes, but it still needs accurate zone settings.
For lawn output, place straight-sided cups across one zone and run it for 15 minutes. The average water collected tells you whether the zone applies water evenly; it is more useful than guessing from a green strip near one head.
Useful Products and Learning
A basic pressure gauge, replacement nozzles, a screwdriver set, and a zone map solve many spring issues. If your controller cannot adjust for weather, our smart controller guide explains the trade-offs. For a complete design before adding zones, use the zone calculator and the DIY installation guide.
When to Call a Professional
Stop the DIY process for a leaking backflow preventer, damaged mainline, suspected electrical fault, or any work requiring a permit. Backflow and cross-connection rules are local public-health requirements, not optional maintenance.
Related guides: Winterizing checklist, Lawn watering by season, USDA zone guides.