How often should I water my lawn during a New Brunswick summer drought?

During a New Brunswick summer drought, your lawn needs approximately 1 inch of water per week from either rainfall or irrigation, applied in 1-2 deep watering sessions rather than frequent light sprinklings. NB typically receives sufficient rainfall from May through June (90-100mm monthly), but July and August can bring extended dry periods when supplemental irrigation becomes critical for maintaining a green, healthy lawn.

The key principle is deep and infrequent watering. Apply 1/2 inch of water twice per week, or a full inch once per week, watering in the early morning (5-9 AM) when evaporation is minimal and wind is typically calm in most NB locations. To measure how long your sprinklers need to run, place several straight-sided containers (tuna cans work perfectly) across your lawn and time how long it takes to collect 1/2 inch of water — this is your benchmark run time for each session. Most NB rotary sprinkler systems need 30-45 minutes per zone, while fixed spray heads typically need 15-20 minutes.

Deep watering encourages grass roots to grow deeper into the soil, making your lawn naturally more drought-resistant. NB lawns watered deeply develop root systems 6-8 inches deep, while those receiving daily light watering have shallow 2-3 inch roots that wilt at the first sign of drought. This is particularly important in NB's sandy coastal soils near Moncton and Shediac, where water drains quickly and surface moisture evaporates fast during hot spells.

During severe drought, consider letting your lawn go dormant rather than trying to keep it green with constant watering. Cool-season grasses used in NB (Kentucky Bluegrass, Fine Fescue, Perennial Ryegrass) are genetically programmed to survive drought by going dormant — turning brown and stopping growth while the crown and root system remain alive underground. A dormant NB lawn will green up within 2-3 weeks once rain returns, with no lasting damage if the drought lasts less than 4-6 weeks. If you choose to let your lawn go dormant, apply 1/4 inch of water every 2-3 weeks to keep the crowns alive, and avoid all foot traffic on dormant turf.

If you decide to keep watering through a drought, be consistent — the worst approach is alternating between watering and letting the lawn go dormant, as this exhausts the grass's energy reserves. Raise your mowing height to 3.5-4 inches during drought conditions, as taller grass shades the soil surface and reduces evaporation by up to 25%. Leave grass clippings on the lawn to act as a natural mulch. Avoid fertilizing during drought, as the salts in fertilizer can further stress already-dehydrated grass.

NB properties on well water should be especially cautious during extended dry periods, as heavy irrigation can draw down well levels. If your well shows reduced flow, prioritize watering trees and shrubs (which take years to replace) over lawns (which recover from dormancy quickly). Ensure your rain sensor is functioning to prevent wasteful watering during NB's scattered summer thunderstorms.

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