Your irrigation controller is the brain of your sprinkler system. But if it’s still running the same schedule you set in April, it’s wasting water — and money — right now. DFW weather changes dramatically from season to season, and your watering schedule needs to change with it.
Let’s walk through how to program your controller for North Texas weather, what smart features are worth the investment, and how to take advantage of local rebate programs.
Why Seasonal Programming Matters
In Dallas, your lawn needs dramatically different amounts of water in July versus November. Running a summer schedule in the fall wastes hundreds of gallons per week. Running a fall schedule in the summer leaves your lawn stressed and brown.
The numbers tell the story:
- **July:** 1.5-2.0 inches of water per week (evapotranspiration peaks at 0.25-0.30 inches per day)
- **October:** 0.5-0.75 inches per week (ET drops to 0.10-0.15 inches per day)
- **January:** 0-0.25 inches per week (dormant grass needs minimal water)
A properly programmed seasonal schedule can reduce your outdoor water use by 20-40% compared to running the same schedule year-round.
Spring Schedule (March-May)
Spring in DFW is unpredictable — warm one week, freezing the next. Your watering schedule should be conservative.
- **Frequency:** 1-2 times per week
- **Run time per zone:** 15-25 minutes (spray heads), 30-40 minutes (rotor heads)
- **Start times:** Early morning (4-6 AM) to reduce evaporation
- **Key adjustment:** Watch the forecast. If rain is predicted within 48 hours, skip the next watering cycle. Spring storms can deliver a week’s worth of water in one afternoon.
DFW tip: March is typically our windiest month. If you have spray heads, consider switching to MP Rotator nozzles — they produce larger water droplets that are less affected by wind.
Summer Schedule (June-August)
This is where your irrigation system earns its keep. DFW summers are hot, dry, and relentless.
- **Frequency:** 3-4 times per week (every other day during heat waves)
- **Run time per zone:** 20-30 minutes (spray), 40-60 minutes (rotor)
- **Start times:** 4-5 AM (first cycle), consider a second cycle at 6-7 AM for heavy clay soil
- **Cycle and soak:** For clay soil, split your run time into two shorter cycles (e.g., two 15-minute cycles instead of one 30-minute cycle) with 30-60 minutes between them. This allows water to soak in rather than run off.
Heat wave protocol: When temperatures exceed 100°F for multiple days, increase frequency but not duration. Your lawn needs more frequent, shorter watering to stay hydrated without waterlogging.
Fall Schedule (September-November)
As temperatures drop and fall rains return, dial back significantly.
- **Frequency:** 1 time per week (September), every 10-14 days (October-November)
- **Run time per zone:** 15-20 minutes (spray), 25-35 minutes (rotor)
- **Start times:** 6-8 AM (later start is fine as temperatures cool)
- **Key adjustment:** Once leaves start falling, reduce watering further. Deciduous trees and warm-season grasses are going dormant and need less water.
DFW tip: September is still hot, but the sun angle changes and evaporation rates drop. You can usually reduce run times by 25% from August levels while maintaining the same soil moisture.
Winter Schedule (December-February)
Your warm-season grass (Bermuda, St. Augustine, Zoysia) is dormant. It doesn’t need regular watering.
- **Frequency:** Every 2-4 weeks (only if no significant rain)
- **Run time per zone:** 10-15 minutes (just enough to keep soil from completely drying out)
- **Start times:** Midday (10 AM-2 PM) — only water when temperatures are above 40°F
- **Key adjustment:** Turn off your automatic schedule entirely and water manually if needed. Most DFW winters provide enough natural precipitation.
Freeze protection: Before the first hard freeze, drain your system completely. If you have a smart controller, enable the freeze sensor setting. Many controllers have a “rain delay” or “seasonal adjust” feature that lets you cut all run times by a percentage — use this instead of reprogramming every zone.
Rain and Freeze Sensors: Your System's Safety Net
A rain sensor is the single most cost-effective upgrade you can make to your irrigation system. It costs $30-60 and automatically shuts off your system when adequate rainfall occurs.
How it works: Most rain sensors use a hygroscopic disk that expands when wet, interrupting the circuit to your controller. When the disk dries out, the circuit reconnects and normal scheduling resumes.
Freeze sensors: These shut off your system when temperatures drop near freezing, preventing ice damage to your lawn and equipment. Many modern controllers have built-in freeze protection that uses local weather data.
DFW requirement: Many North Texas municipalities require rain sensors on all automatic irrigation systems. Check your local code — Dallas, Plano, and Frisco all have rain sensor requirements.
Smart Controllers: The Next Level
Smart irrigation controllers use local weather data, soil moisture sensors, or historical ET data to automatically adjust your watering schedule. They’re not just convenient — they’re proven water savers.
Types of smart controllers:
- **WiFi-connected ET controllers** — Use local weather station data to calculate daily water needs. Examples: Rachio 3, Hunter Hydrawise, Orbit B-hyve
- **Soil moisture-based controllers** — Use buried sensors to measure actual soil moisture and water only when needed
- **Historical ET controllers** — Use a programmed water budget based on your area’s historical climate data
Benefits for DFW homeowners:
- Automatically adjust for rain, wind, and temperature changes
- Remote control via smartphone app
- Water usage reports and leak detection
- Integration with weather forecasts (skip watering if rain is coming)
Cost: $150-$400 for the controller, plus installation. Many DFW water utilities offer rebates of $50-$100 for smart controller installation.
Zone Programming Best Practices
Each zone in your system has different water needs. Program them individually:
- **Turf zones (Bermuda grass):** Deep, infrequent watering — 30-40 minutes, 2-3 times per week in summer
- **Turf zones (St. Augustine):** More frequent, shorter cycles — 20-25 minutes, 3-4 times per week
- **Shrub and bed zones:** Drip irrigation — 45-60 minutes, 1-2 times per week
- **Foundation watering zones:** 30-45 minutes, 2-3 times per week (see our foundation watering guide)
- **Slope zones:** Cycle and soak — split into 10-15 minute cycles to prevent runoff
DFW Water Restrictions: What You Need to Know
Most DFW municipalities have year-round watering restrictions. The specifics vary by city, but the general rules are:
- **Dallas:** No outdoor watering between 10 AM and 6 PM. Odd-numbered addresses water on Wednesdays and Saturdays; even-numbered on Thursdays and Sundays.
- **Mesquite:** Same time restrictions. Address-based schedule varies by season.
- **Garland:** No watering 10 AM-6 PM. Two-day-per-week schedule based on address.
- **Plano/Frisco/Allen:** Similar restrictions with local variations.
Smart controller advantage: WiFi-connected controllers can be programmed to comply with your city’s specific restrictions automatically.
Rebate Programs in DFW
Several North Texas water utilities offer rebates for water-efficient irrigation upgrades:
- **Dallas Water Utilities:** Up to $100 rebate for smart irrigation controllers
- **North Texas Municipal Water District:** Rebates for rain sensors, smart controllers, and drip irrigation conversions
- **Upper Trinity Regional Water District:** Similar rebate programs for member cities
Check with your local water provider for current rebate amounts and eligibility requirements.
Let Groundhogs Services Optimize Your System
Programming an irrigation controller for DFW’s variable weather takes knowledge and experience. Get it wrong and you’re either wasting water or stressing your landscape. Get it right and you’ll have a beautiful lawn with the lowest possible water bill.
Groundhogs Services offers irrigation controller programming, smart controller installation, and seasonal schedule management for DFW homeowners. Call (214) 713-1228 or visit groundhogstx.com to schedule a system evaluation.