Fall Sprinkler Adjustments for Fort Worth Lawns

Fall is a transition season for Fort Worth lawns. Days are still warm in September, often hot, but by November, warm-season grasses are slowing down and getting ready for dormancy. A sprinkler system still set for August will overwater through much of the fall. This article covers the adjustments to make as the season changes and the jobs worth doing before winter.

Why Fall Watering Is Different

As temperatures drop and days get shorter, grass grows more slowly and uses less water. Less water evaporates from the soil. Fall rain often returns after the summer dry spell. All of that means the lawn needs less irrigation than it did in summer. Yet the watering schedule is the same: twice a week on your assigned days, outside 10 a.m. to 6 p.m.

Overwatering in fall can lead to:

• Fungal lawn diseases, especially in St. Augustine as nights cool
• Winter weeds getting a head start
• Soggy soil and wasted water

Step 1: Lower Run Times Gradually

Rather than cutting everything at once, lower run times in steps as the weather cools. The seasonal adjust feature on most controllers makes this easy. Lower it in late September, again in October and again in November. Watch the lawn between steps. If an area starts to show stress, bring that zone back up a little. Our controller programming guide explains how to use seasonal adjust.

Step 2: Let Fall Rain Count

After a good rain, skip the next watering day or two. A working rain sensor helps, but it only reacts to rain as it falls. After a soaking rain, a manual rain delay keeps the system off while the soil is still moist. Our article on rain and freeze sensors explains how sensors work.

Step 3: Check Coverage One More Time

Summer heat reveals every coverage problem. Before the grass goes dormant and hides them, walk each zone and note brown areas that line up with gaps between heads, heads blocked by plants that grew over summer, and heads knocked over by summer yard work. Fixing them in fall means the lawn is ready when it greens up next spring. Our zone-by-zone system check walks through the process.

Step 4: Plan for Overseeding

If you overseed a Bermuda lawn with ryegrass for winter color, the new seed needs frequent light watering to germinate. Within the twice-a-week schedule, that can be a challenge. Check with the city about establishment provisions for new seed before watering outside your assigned days. Hand watering is allowed at any time, which can help keep a seeded area moist.

Step 5: Watch Out for Leaves

Falling leaves can block spray heads and clog nozzles. They also pile up on rain sensors, which can keep the sensor from drying out and hold the system off longer than intended. Clear leaves from the sensor and from around heads as needed.

Step 6: Service Drip Zones

Plants in beds need less water in fall too. Lower drip run times along with lawn zones. Clean the drip filter and flush the lines before winter.

Step 7: Aerate

Fall is a good time to aerate warm-season lawns in North Texas, while the grass is still growing. Mark sprinkler heads first so the aerator does not damage them. Aeration helps water soak into compacted clay next season.

Step 8: Plan Winter Protection

Before the first hard freeze, decide whether you will keep the system on through winter or shut it down. Either way, have an insulated cover ready for the backflow preventer. Our guide to winterizing a sprinkler system explains both approaches, and our article on protecting your backflow preventer from freezing covers the most exposed part.

Step 9: Schedule Repairs Before Winter

Leaks and broken parts are easier to repair in fall than in the middle of winter. If you found problems over the summer, fall is a good time to fix them. Fall is also a good time for upgrades like rotary nozzles, check valves or drip conversions, so they are in place for next spring.

A Sample Fall Progression

Every yard is different, but a common pattern looks like this:

• September: still summer-like; begin trimming run times slightly as nights cool.
• October: lower run times further, skip cycles after rain.
• November: grass slows toward dormancy; water only when dry, or shut down for winter.

Adjust based on rain, temperatures and how your lawn looks.

Trees in Fall

Fall is a good time to plant trees and shrubs in North Texas, since cooler weather gives roots time to grow before summer. New plantings need regular water through fall and winter. Drip lines, soaker hoses and hand watering are allowed at any time in Fort Worth.

Fall Fertilizer and Water

If you fertilize in early fall, water it in according to the product label, on one of your assigned days. Avoid heavy nitrogen late in the season on warm-season grasses, since it pushes new growth just as the grass should be slowing down for winter, and that tender growth needs more water. Keep fertilizer off sidewalks and driveways, where sprinkler overspray or rain can carry it into the street. A light application in early fall, if any, is usually enough.

Keep an Eye on Warm Spells

Fort Worth falls often bring a run of warm, dry days after a cool snap. If that happens, it is fine to bump run times back up for a week or two. Watch the lawn and the soil rather than the calendar.

When to Call a Technician

If you want your system adjusted for fall, repaired before winter or set up with a smart controller that adjusts on its own, our sprinkler repair service can help.

Spring storms are a different kind of seasonal check. Our article on checking your system after spring storms covers what to look for after hail and high winds.