FL Irrigation Winterization & Spring Start-Up Guide
Freeze prep · Backflow preventer protection · Zone pressure test · FL WMD seasonal scheduling · Spring activation checklist
FL Water Management Districts · Backflow Code · All 5 FL Regions · Freeze Alert Guide
❄️FL Freeze Risk by Region
Florida freezes are rare but devastating to unprepared irrigation systems. Even South Florida occasionally sees temperatures near freezing during January cold fronts. Damage to backflow preventers and exposed PVC can cost $500–$2,500 to repair.
South FL (PBC/Broward/Miami-Dade) — freeze riskLow — occurs once every 5–10 years
Temperature at which PVC sprinkler heads crackBelow 28°F for 4+ hours
Temperature at which backflow preventers freezeBelow 32°F for 2+ hours (exposed)
FL Freeze Warning: When the National Weather Service issues a Freeze Warning (below 32°F) or Frost Advisory for your county, your irrigation backflow preventer is the most vulnerable component. An exposed, uninsulated RPZ or PVB can freeze and crack in a single overnight frost, flooding your yard when it thaws and requiring full replacement.
🧊Freeze Prep Checklist — Before a Cold Front
Tap each item to mark complete. Complete all critical items before temperatures drop below 35°F.
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Check NWS freeze forecast CRITICAL
Monitor weather.gov for your county. A Freeze Warning means below 32°F for 2+ hours — take immediate action. A Frost Advisory means 33–36°F — protect backflow preventers.
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Wrap backflow preventer with insulation CRITICAL
Use foam pipe insulation or a commercial backflow preventer cover bag on your RPZ, PVB, or DCVA. Do NOT use plastic bags — they trap moisture. Insulation bags cost $15–$40 at hardware stores.
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Locate and know how to close irrigation shutoff valve CRITICAL
Find the main irrigation supply shutoff (usually near the backflow preventer or water meter). If a backflow preventer freezes and bursts, you need to shut off water immediately to prevent flooding.
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Turn irrigation controller to "OFF" or "Rain" mode CRITICAL
Do NOT run your irrigation system during a freeze event — wet grass and plants freeze faster. Put your controller in Rain mode or manually suspend all schedules during the cold period.
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Drain exposed above-ground pipe sections IMPORTANT
Open drain caps or manual drain valves on any exposed above-ground PVC between the water meter and backflow preventer. Water in exposed pipe above ground is most vulnerable to freezing.
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Insulate exposed PVC risers and laterals IMPORTANT
Any PVC pipe exposed above ground — including pump connections, riser pipes near exterior walls — should be wrapped with foam pipe insulation and secured with waterproof tape before the freeze.
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Check valve boxes for standing water IMPORTANT
Open each valve box (green or black underground plastic box). If water has pooled inside, bail it out — standing water in valve boxes can freeze and crack solenoid valves and fittings.
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Test rain/freeze sensor function RECOMMENDED
FL requires rain sensors on all new irrigation systems (FS §373.62). Verify your rain/freeze sensor is connected and working — a freeze sensor will automatically suspend irrigation when temps approach freezing.
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Check pump (if applicable) for freeze protection IMPORTANT
If your irrigation is pump-fed (lake, well, cistern), ensure the pump and its housing are protected. Most FL irrigation pumps are above-ground and vulnerable to freezing — wrap pump body and supply pipe.
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Notify tenants / HOA of temporary irrigation suspension RECOMMENDED
If you manage a rental or HOA, communicate that irrigation will be offline during the freeze event to avoid calls about "broken sprinklers." Include expected duration and when service will resume.
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Know your WMD watering day restrictions RECOMMENDED
Florida Water Management Districts suspend year-round watering restrictions during freeze events — you may run extra irrigation before a hard freeze to protect plants, but check your WMD for specifics.
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Inspect system within 24 hours after freeze CRITICAL
As temperatures rise after the freeze, walk the entire system and check: backflow preventer for cracks/leaks, valve boxes for broken fittings, spray heads for cracked bodies, and main supply for wet ground indicating pipe breaks.
🛡️Backflow Preventer Freeze Protection — FL Code
Florida Plumbing Code §608 requires backflow prevention on all irrigation systems connected to potable water. Protecting these devices from freeze damage is both a safety and code compliance issue.
RPZ (Reduced Pressure Zone) — most vulnerable to freezeMust drain or insulate — contains water-filled relief valve
PVB (Pressure Vacuum Breaker) — second most vulnerableInsulate bonnet, body, and supply pipe
DCVA (Double Check Valve) — often buried, more protectedUsually protected if below grade — check above-ground ports
Commercial backflow preventer inspection frequencyAnnual (required by FL code)
Cost to replace cracked RPZ backflow preventer (FL)$400–$1,200 installed
Cost of foam backflow insulation bag (prevention)$15–$40 at hardware store
FL Backflow Annual Test Requirement: FL law requires all RPZ, PVB, and DCVA backflow preventers on irrigation systems to be tested annually by a licensed FL backflow tester. If your device was damaged during a freeze event, it must be repaired AND retested before being returned to service. Frozen/cracked devices fail backflow protection entirely.
📅FL WMD Seasonal Watering Schedules
Each Florida Water Management District sets seasonal watering restrictions. These override your controller schedule unless you have a specific exemption or variance. Winter schedules are more restrictive to reduce irrigation demand during cool months.
SFWMD (Palm Beach / Broward / Miami-Dade / Collier / Lee) — Year-round base rule2 days/week max
SFWMD — Winter (Nov–Mar) for most odd-even addresses1 day/week recommended
SRWMD (North FL / Gainesville area)2 days/week; 1 day Nov–Mar
NWFWMD (Panhandle — Pensacola / Panama City / Tallahassee)2 days/week; winter varies
All WMDs — prohibited irrigation hours10 AM – 4 PM daily
All WMDs — irrigation during/after rainfall prohibited48 hrs after ≥0.5" rain
Smart Controller Exemption: All 5 FL WMDs offer exemptions from day/time restrictions for properties with EPA WaterSense-certified smart irrigation controllers (ET-based or soil moisture sensor-based). With a qualifying smart controller, you may irrigate as needed based on actual plant water requirements rather than a fixed schedule. Get a variance from your local WMD — it's free.
🌱FL Irrigation Spring Activation Checklist
Best performed February–March in South FL, March–April in Central FL, April in North FL. Complete all steps before setting your summer schedule.
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Inspect backflow preventer for freeze damage FIRST STEP
Before opening the main supply, visually inspect the backflow preventer. Look for cracks, bulges, or displaced relief valve bonnets. Do NOT open the supply valve if you see damage — replace first.
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Slowly open main irrigation supply valve CRITICAL
Open the main shutoff SLOWLY — over 60–90 seconds — to avoid water hammer. Sudden pressure surges can crack PVC fittings, damage solenoid valves, and break spray heads throughout the system.
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Check supply pressure at backflow preventer CRITICAL
Use a water pressure gauge (screw onto hose bib or backflow test port). Normal FL municipal supply: 50–80 PSI. If over 80 PSI, your pressure regulator may have failed. High pressure damages heads and diaphragms.
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Run each zone manually from controller — 2 minutes each CRITICAL
Stand at the controller, run each zone manually for 2 minutes, and walk the zone while it runs. Look for broken heads, geysers, missing heads, and dry zones indicating blocked or broken laterals.
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Adjust spray head arc and radius for new plant growth IMPORTANT
Plants grow over winter. Check that spray patterns still reach all landscape areas and that no heads are blocked by overgrown shrubs, grass, or tree roots pushing heads up. Adjust or replace as needed.
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Replace broken or missing spray heads and rotors IMPORTANT
Mark broken heads with flags during the walk-through. Replace same-brand, same-precipitation-rate heads — mixing brands with different precipitation rates creates dry and wet spots (hydrozoning issue).
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Clean or replace clogged nozzles and filters IMPORTANT
FL reclaimed water and hard water leave mineral deposits in nozzles. Remove clogged nozzles, soak in white vinegar 30 minutes, rinse. Replace any with cracked or warped bodies — they won't seal properly.
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Open and inspect each valve box IMPORTANT
Check solenoid valves for cracks, corrosion, or debris in the diaphragm. Flush valve boxes that filled with soil. A stuck-open solenoid valve wastes thousands of gallons per day and violates WMD restrictions.
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Test rain sensor and freeze sensor operation IMPORTANT
Required by FL law (FS §373.62). Pour water on the rain sensor disc and verify the controller receives the skip signal. For freeze sensors, verify wiring and the temperature trigger setting (32–37°F typical for FL).
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Program summer irrigation schedule — WMD compliant CRITICAL
Set your controller to your WMD-compliant days and times. Irrigation must start and finish before 10 AM or begin after 4 PM per FL WMD rules. Program seasonal runtime adjustments or use ET-based smart scheduling.
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Check and adjust drip emitters in planting beds RECOMMENDED
Drip emitters clog easily in FL's hard water. Remove and soak any clogged emitters or replace — they're inexpensive. Check drip tubing for breaks, ant damage, or root infiltration. Flush the drip circuit before use.
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Verify pump operation (if pump-fed system) IMPORTANT
Run the pump and check: starting amps, operating pressure, flow rate. Check the pump pressure switch setting. Inspect impeller for debris. Service the pump annually before the summer irrigation season begins.
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Document zone runtimes and coverage for each zone RECOMMENDED
Walk each zone and note: which areas it covers, head types, any problem areas. Take photos. This documentation helps when troubleshooting issues mid-summer or planning future system modifications.
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Schedule annual backflow preventer test LEGALLY REQUIRED
FL requires annual backflow preventer testing by a licensed tester. Spring start-up is the ideal time. Cost: $65–$150. Your water utility may send notices — failure to test can result in service suspension in some FL municipalities.
⏰FL Summer Irrigation Runtime Guide by Grass Type
Starting runtimes for Florida's rainy season (June–September). Adjust based on actual turf conditions and rainfall. FL's summer rainfall (avg 6–8 inches/month in most areas) typically provides most of your landscape water needs.
St. Augustine (most common FL grass) — summer runtime15–20 min 2×/week (spray heads)
Zoysia — summer runtime10–15 min 2×/week
Bahia — summer runtime (drought-tolerant)10–15 min 1–2×/week
Bermuda — summer runtime12–18 min 2×/week
Floratam St. Augustine (most common cultivar) — winter runtime20–25 min 1×/week (Dec–Feb South FL)
Optimal irrigation start time (any grass, FL code)4 AM – 9 AM
FL Rainy Season Tip: June–September, most FL lawns need 0 supplemental irrigation during weeks with 0.5+ inches of natural rainfall. Program your controller's seasonal adjustment to 0% during June–September and use a rain sensor to skip watering after rain events. This easily cuts water bills by $40–$100/month in summer.
🔬Zone-by-Zone Pressure & Flow Checker
Check each irrigation zone for correct operating pressure and expected head count. Low pressure indicates a broken pipe, missing head, or partially closed valve. High pressure indicates a failed pressure regulator.
How to measure zone pressure: Use a pressure gauge with a 3/4" hose thread adapter. Cap all heads in the zone except one, attach the gauge to the open head riser, and run the zone. Or use a pitot tube gauge at an open head. Normal FL zone operating pressure: 30–50 PSI at the head.
📊FL Irrigation Pressure Reference
Minimum operating pressure — pop-up spray heads15–20 PSI at head
Optimal operating pressure — pop-up spray heads30 PSI at head
Optimal pressure — gear-drive rotors (e.g., Rain Bird 5000)30–50 PSI at head
Optimal pressure — MP Rotator nozzles40–55 PSI at head
Optimal pressure — drip emitters15–25 PSI at emitter
Typical pressure loss — 100 ft 1" PVC at 10 GPM~3–4 PSI
Pressure drop indicating underground leak>15 PSI drop vs. expected
Pressure-Regulating Heads: If your FL municipal supply exceeds 65 PSI, install pressure-regulating spray heads (e.g., Hunter Pro-Spray PRS, Rain Bird 1800-PRS). These maintain 30 PSI at the head regardless of supply pressure, reducing misting, improving uniformity, and extending head life by 30–50%.
💧FL Sprinkler Head Precipitation Rate Guide
Matching precipitation rates across zones ensures even coverage. FL's sandy soils absorb water quickly — application rates above 0.75 in/hour on flat ground cause runoff. Slopes require even lower application rates.
Fixed spray head — 8-ft radius, full circle1.4 in/hour
Fixed spray head — 10-ft radius, full circle1.5 in/hour
Fixed spray head — 12-ft radius, full circle1.7 in/hour
Rain Bird 5000 rotor — 30-ft radius, full circle0.5 in/hour
MP Rotator — 13-ft radius, full circle0.4 in/hour
Drip emitter — 0.5 GPH per emitterVaries by spacing
Mixed Head Type Warning: Never mix spray heads and rotors on the same zone — they have very different precipitation rates and the zone runtime that properly waters rotor areas will severely overwater spray head areas (and vice versa). This is a common FL irrigation error and a WMD compliance violation (runoff).
🛠️Schedule Irrigation Service
We handle all Florida irrigation plumbing — backflow preventer installation and annual testing, system audits, winterization service, spring start-up, head replacement, zone troubleshooting, and WMD compliance work. Licensed & insured.
✅ Our Irrigation Services: • Annual backflow preventer test & certification (FL code required) • Spring start-up inspection & zone audit • Freeze damage repair (backflow preventers, PVC, heads) • WMD compliance review & watering schedule setup • Broken head replacement & zone repair • Smart controller installation & programming • Pump service & pressure testing • New system installation & FL permit
⚡Emergency Irrigation Service
Broken main irrigation line, flooded yard, or burst backflow preventer after a freeze? We respond within 2 hours.
(561) 316-7450
24/7 Emergency · Licensed & Insured · All FL Counties