Last updated: June 1, 2026
As June arrives in New Jersey, temperatures routinely climb into the mid-90s, and cool-season grasses begin to experience severe heat stress. Compounding the issue, the New Jersey Department of Environmental Protection (NJDEP) has maintained a statewide Drought Warning for the summer of 2026 [1].
With 20 of the past 23 months recording below-normal precipitation [2], homeowners in Bergen, Passaic, and surrounding counties are asking the same question: How often should I water my lawn in NJ during the summer drought?
The short answer is that you should limit lawn watering to a maximum of two days per week, applying roughly 1 inch of water total, and always water between 4:00 AM and 9:00 AM [3]. However, achieving that exact 1-inch target requires understanding your specific sprinkler heads, soil type, and the local evapotranspiration rate.
At Greg Tanzer Sprinklers, we have managed residential and commercial irrigation systems in Northern New Jersey for over 40 years. This guide provides the exact, data-backed sprinkler settings you need to keep your lawn alive this June while complying with state water conservation mandates.
Understanding June Evapotranspiration in New Jersey
To understand how much water your lawn needs, you must understand how much it loses. Evapotranspiration (PET) is the process by which water is transferred from the land to the atmosphere by evaporation from the soil and transpiration from plants.
According to data from the Northeast Regional Climate Center at Cornell University, the average PET rate for the Newark, NJ area in June is 4.08 inches [4]. This means your lawn loses approximately 0.136 inches of water every single day.
Because cool-season grasses (like Tall Fescue and Kentucky Bluegrass) require about 1 to 1.5 inches of water per week to maintain active growth [5], you must replace what the sun evaporates. If rainfall does not provide that 1 inch, your sprinkler system must make up the difference.
Zone-by-Zone Sprinkler Run Times for NJ Lawns
Not all sprinkler heads deliver water at the same speed. A common mistake homeowners make is setting every zone on their controller to run for 20 minutes. Depending on the head type, 20 minutes could severely underwater one zone while flooding another.
Here are the recommended run times to achieve the necessary moisture depth based on standard precipitation rates [6]:
| Sprinkler Head Type | Precipitation Rate | Recommended Run Time (Per Cycle) | Best Use Case |
|---|---|---|---|
| Fixed Spray Heads | 1.5 to 2.0 inches/hour | 10 to 15 minutes | Small, defined turf areas and garden beds |
| Rotor Heads | 0.4 to 0.8 inches/hour | 25 to 40 minutes | Large, open turf zones |
| Rotary Nozzles | 0.4 inches/hour | 25 to 40 minutes | Mid-size turf and sloped areas |
Note: These times represent a single cycle. To achieve 1 inch of water per week on a two-day watering schedule, you will need to adjust these base times according to your specific system’s output.
The “Cycle and Soak” Method for Northern NJ Clay Soils
Northern New Jersey soils, particularly in areas of Bergen and Passaic counties, often contain high amounts of clay or glacial till (such as the Boonton soil series) [7]. Clay soil absorbs water very slowly, roughly 0.2 to 0.5 inches per hour.
Because fixed spray heads apply water at 1.5 to 2.0 inches per hour, running a spray zone for 30 continuous minutes will result in massive runoff. The water will flow onto your driveway or street rather than reaching the grass roots.
To prevent runoff and ensure deep root hydration, you must use the Cycle and Soak method:
- Divide your total required run time in half.
- Run the zone for the first half of the time (e.g., 10 minutes for a spray zone).
- Allow the system to rest for 30 to 60 minutes so the clay soil can absorb the water.
- Run the zone for the second half of the time (e.g., another 10 minutes).
Upgrading to Smart Irrigation During a Drought
If managing precipitation rates, evapotranspiration, andcycle-and-soak schedules sounds overwhelming, technology can handle it for you.
Upgrading from a standard clock-based timer to a Wi-Fi-enabled smart controller (like the Hydrawise system installed by Greg Tanzer Sprinklers) is the single most effective step you can take to conserve water this June.
According to the U.S. Environmental Protection Agency (EPA), replacing a standard clock-based controller with a WaterSense-labeled weather-based irrigation controller can save an average home nearly 7,600 to 15,000 gallons of water annually [8]. These controllers automatically adjust your watering schedule daily based on local temperature, rainfall, and humidity data.
Frequently Asked Questions (FAQ)
What is the best time of day to water my lawn in New Jersey? The optimal time to water your lawn in New Jersey is between 4:00 AM and 9:00 AM. Watering early in the morning reduces water loss to evaporation and ensures the grass blades dry quickly as the sun rises, which prevents fungal diseases. Never water during the heat of the afternoon, and avoid evening watering, which leaves the lawn damp overnight.
How many days a week should I water my lawn in June? During the 2026 drought warning, the NJDEP strongly urges residents to limit lawn watering to a maximum of two days per week. Deep, infrequent watering encourages grass roots to grow deeper into the soil, making the lawn more drought-resistant.
Should I let my lawn go dormant during the summer drought? Yes, allowing cool-season grasses to go dormant is a valid survival strategy during severe droughts. The grass will turn brown, but the crown remains alive. If you choose to let the lawn go dormant, do not apply fertilizer, minimize foot traffic, and provide about 0.5 inches of water every two to three weeks just to keep the crowns alive until cooler fall weather returns.
How high should I cut my grass in the summer? You should raise your mower blade to keep the grass height between 2.5 and 3.5 inches during the summer months. Taller grass shades the soil, reducing evaporation and protecting the roots from extreme heat stress.
References
[1] New Jersey Department of Environmental Protection. (2026, May 5). Sherrill Administration Urges Public to Continue Voluntarily Conserving Water as Drought Conditions Persist. Retrieved from https://dep.nj.gov/newsrel/26_0020/
[2] New Jersey Weather and Climate Network. (n.d.). Drought. Retrieved from https://www.njweather.org/drought
[3] New Jersey American Water. (2026, May 20). New Jersey American Water Provides Wise Water Tips for Summer as New Jersey Drought Warning Remains in Effect. Retrieved from https://newsroom.amwater.com/2026-05-20-New-Jersey-American-Water-Provides-Wise-Water-Tips-for-Summer-as-New-Jersey-Drought-Warning-Remains-in-Effect
[4] Northeast Regional Climate Center. (n.d.). Monthly PET Averages. Retrieved from https://www.nrcc.cornell.edu/wxstation/pet/pet.html
[5] Rutgers New Jersey Agricultural Experiment Station. (2001, May 1). Best Management Practices for Watering Lawns. Retrieved from https://njaes.rutgers.edu/pubs/publication.php?pid=fs555
[6] Sprinkler Medics. (2026, March 25). Rotary vs Spray Sprinkler Heads: Which Is Better for Your Lawn. Retrieved from https://sprinklermedics.com/otary-vs-spray-sprinkler-heads-which-is-better-for-your-lawn/
[7] Shore Systems Group L.L.C. (2025, November 25). New Jersey Soil Types, Regions and Testing Guide. Retrieved from https://www.shorellc.com/articles/nj-soils-and-testing-guide
[8] U.S. Environmental Protection Agency. (2026, March 5). WaterSense Labeled Controllers. Retrieved from https://www.epa.gov/watersense/watersense-labeled-controllers