Seasonal Watering Guide for Tracy and Mountain House
Seasonal Sprinkler Adjustments: A Homeowner’s Guide to Watering Smarter Throughout the Year
Updated October 2026
Did you know your lawn doesn’t need the same amount of water in January as it does in July? In Tracy and Mountain House, California, our hot, dry summers and cooler, wetter winters create significant changes in how much water our lawns need throughout the year. One of the most common mistakes homeowners make is setting their sprinkler timer in the spring and leaving it unchanged for the rest of the year. Adjusting your sprinkler schedule with the seasons can help maintain a healthier lawn, reduce water waste, and potentially lower your water bill. Fortunately, many irrigation controllers have a feature called Seasonal Adjustment or Budget that makes this easy.
What Is Seasonal Adjustment?
Seasonal adjustment is a feature found on many automatic sprinkler controllers that allows you to increase or decrease watering time using a percentage. Instead of changing the individual watering times for every sprinkler zone, you can adjust the entire program with one setting. For example, if a sprinkler zone normally operates for 20 minutes at 100%:
- At 90%, it runs for 18 minutes.
- At 80%, it runs for 16 minutes.
- At 60%, it runs for 12 minutes.
- At 50%, it runs for 10 minutes.
- At 40%, it runs for 8 minutes.
- At 20%, it runs for 4 minutes.
This allows you to reduce watering during cooler months and increase it as temperatures rise.
Why July Is Used as the 100% Reference Point
In the Central Valley, July generally represents the period of highest landscape water demand. Hot temperatures, long days, and very little rainfall increase the amount of water lost through evaporation and plant transpiration. For this reason, July is commonly used as the 100% reference point when establishing seasonal watering schedules. Other months are then adjusted as a percentage of that peak summer watering schedule.
Recommended Monthly Seasonal Watering Adjustments
The following percentages are suggested starting points for homeowners in Tracy and Mountain House, California. They are adapted from regional seasonal watering patterns for the Central Valley.
Seasonal setting by month (percent of your July time)
| January | 10% or OFF | |
| February | 20% or OFF | |
| March | 40% | |
| April | 60% | |
| May | 80% | |
| June | 90% | |
| July | 100% | |
| August | 90% | |
| September | 70% | |
| October | 50% | |
| November | 20% or OFF | |
| December | 10% or OFF |
These bars are starting points. Your lawn may need a little more or less in any month.
Month-by-Month Settings and Notes
| Month | Seasonal Adjustment | What to Do |
|---|---|---|
| January | 10% or OFF | Winter rainfall often provides sufficient moisture. Turn off your irrigation system during rainy periods and water only when conditions require it. |
| February | 20% or OFF | Water needs remain low, although warmer or unusually dry weather may require some supplemental irrigation. |
| March | 40% | As temperatures begin to rise and lawns become more active, gradually increase watering. |
| April | 60% | Spring growth increases water demand. Check sprinkler coverage and make sure your lawn is receiving water evenly. |
| May | 80% | Temperatures are climbing, and lawns begin using considerably more water. Inspect for dry spots and make adjustments before summer. |
| June | 90% | Summer temperatures increase water demand. Proper irrigation coverage becomes especially important. |
| July | 100% | This is the peak reference month. Your irrigation schedule should be based on the actual water requirements of your lawn and the output of your sprinkler system. |
| August | 90% | August remains one of the hottest months in Tracy and Mountain House. Although daylight hours begin to shorten, high temperatures continue to create substantial watering demands. Maintaining irrigation at approximately 90% of the July peak is a reasonable starting point. Monitor soil moisture and lawn conditions, adjusting as necessary. |
| September | 70% | As temperatures gradually decline, watering requirements begin to decrease. This is also an important time to prepare Fescue lawns for fall recovery, including aeration and overseeding when conditions are appropriate. |
| October | 50% | October brings cooler temperatures and shorter days, reducing the amount of water lawns require. Decreasing irrigation to approximately 50% of the July peak helps prevent unnecessary watering while maintaining adequate moisture. As seasonal rainfall begins, reduce watering further or turn off the system when sufficient moisture is available. |
| November | 20% or OFF | Most established lawns require very little supplemental irrigation when temperatures are cool and rainfall is occurring. |
| December | 10% or OFF | Winter rainfall may eliminate the need for supplemental watering. Avoid running sprinklers when the soil is already adequately moist. |
If your lawn looks dry or stressed, increase the setting by about 10%. If the soil stays wet or you see runoff, lower it by about 10%.
Bermuda vs. Fescue: Does Grass Type Make a Difference?
Absolutely! Although seasonal percentages provide a useful starting point, Bermuda and Fescue have different growing seasons and watering requirements.
Bermuda Grass: Warm-Season Turf
Bermuda thrives during the warmer months and generally requires less water than Fescue when both are actively growing under similar conditions. During summer, Bermuda grows rapidly and benefits from properly scheduled watering. As temperatures cool in fall, Bermuda begins slowing down and eventually enters dormancy. During winter, dormant Bermuda requires very little supplemental irrigation, particularly when rainfall keeps the soil adequately moist. Bermuda watering considerations:
- Highest water demand occurs during active summer growth.
- Reduce watering as the grass enters dormancy.
- Avoid unnecessary irrigation during winter.
- Resume regular irrigation as spring growth returns.
Fescue Grass: Cool-Season Turf
Fescue behaves differently because it is a cool-season grass. Unlike Bermuda, Fescue generally remains green throughout winter and grows actively during cooler weather. However, Fescue can struggle during the intense summer temperatures experienced in Tracy and Mountain House. It often requires more water than Bermuda to maintain its green appearance during hot weather. Fescue watering considerations:
- Maintain consistent moisture during summer heat.
- Avoid frequent, shallow watering.
- Reduce irrigation during cool, rainy weather.
- Remember that Fescue may still require supplemental water during dry winter periods.
Don’t Forget About Rainfall
One of the biggest benefits of seasonal irrigation adjustments is avoiding unnecessary watering during the rainy season. Even if your controller is set to 10% or 20%, running sprinklers when the ground is already wet can waste water. Excessive watering can also contribute to:
- Shallow root development
- Fungal diseases
- Soil saturation
- Nutrient loss
- Increased weed pressure
A rain sensor or smart irrigation controller can help prevent unnecessary watering. For homeowners using a traditional controller, regularly checking the weather and manually turning off irrigation during rainy periods is important.
How Often Should You Adjust Your Sprinkler Timer?
We recommend reviewing your irrigation controller at the beginning of every month. However, don’t rely exclusively on the calendar. A particularly hot June may require more water than average, while a cool, rainy October may require significantly less. Your lawn’s appearance, soil moisture, and recent weather conditions should help guide your decisions. Some newer smart irrigation controllers automatically adjust schedules using local weather information. If you have one of these systems, make sure its settings are configured correctly before making additional manual adjustments.
Proper Watering Is About More Than Minutes
Seasonal adjustments are helpful, but they cannot correct problems with your irrigation system. A sprinkler that is clogged, damaged, improperly adjusted, or providing uneven coverage can leave some areas too wet and others too dry. Soil conditions also matter. Many properties in Tracy and Mountain House have clay-heavy soils that absorb water slowly. Running sprinklers continuously for too long may create runoff before the water has an opportunity to soak into the ground. In these situations, shorter watering cycles separated by soaking periods can improve water absorption. Regular irrigation inspections can help identify these problems before they cause serious turf damage. If something looks wrong, our sprinkler and irrigation repair service can help.
Remember Local Watering Restrictions
Homeowners must also follow their local water provider’s irrigation requirements. The City of Tracy limits sprinkler watering to set days and hours based on your address, and the rules change with the city’s current water-shortage stage. Check the City of Tracy water conservation page for the current schedule before programming your irrigation controller. Mountain House is served by the Mountain House Community Services District, which has its own water conservation requirements. Check with the district for the current rules. Because watering regulations can change, always confirm the current restrictions before you set your timer. Watering early in the morning also helps reduce water lost to evaporation.
Download the Printable Cheat Sheet (PDF)
A Healthier Lawn Starts With Smarter Watering
Proper seasonal watering is one of the simplest ways to improve lawn health while conserving water. By adjusting your sprinkler timer throughout the year, you can help prevent overwatering, reduce unnecessary water use, and provide your lawn with the moisture it needs as conditions change. Whether you have Bermuda or Fescue, understanding seasonal watering requirements can make a noticeable difference in your lawn’s health and appearance.
Need Help With Your Lawn or Irrigation System?
At Lawn and Yard Solutions, we help homeowners throughout Tracy and Mountain House, California, maintain healthy, attractive lawns. Whether you’re experiencing dry spots, uneven sprinkler coverage, irrigation problems, or other lawn issues, we can help identify the cause and recommend appropriate solutions. Our services include lawn mowing, fertilization, weed control, sprinkler repairs, aeration, overseeding, and other lawn care services. Contact Lawn and Yard Solutions at (209) 442-3567 or request an estimate online. Get My Price & Book Service Let us help you keep your lawn looking its best throughout the year!