How Often Should You Mow in Summer? A Guide by Grass Type

Lawn maintenance in summer is very different from that in other seasons. Warm-season grasses need weekly mowing from May through September, sometimes more frequently during peak growth weeks. Cool-season grasses slow in summer heat and should be mowed every 10-14 days at a raised height to protect roots from heat stress. Getting frequency and height wrong in the same direction is the most common cause of heat-stressed and scalped lawns across our portfolio.

Summer Mowing at a Glance #

Grass Type	Summer Height	Mowing Frequency	Primary Markets
Bermuda	1.5-2 inches	Every 6-7 days	Phoenix, Las Vegas, Dallas, Tampa, Atlanta
Zoysia	1-2 inches	Every 7 days	Dallas, Atlanta
St. Augustine	3-3.5 inches	Every 7 days	Tampa, Jacksonville, Orlando
Tall Fescue	3.5-4 inches	Every 10-14 days	Denver, Seattle, Atlanta (shaded)
Kentucky Bluegrass	3-3.5 inches	Every 10-14 days	Denver, Seattle

Warm-Season Grass Mowing in Summer #

Warm-season grasses grow aggressively from late May through September. The minimum mowing frequency during this window is weekly, not biweekly, or on demand. Falling behind on warm-season mowing creates a scalping problem on the next visit that can stress or damage the lawn.

Bermuda: Weekly Minimum, Height 1.5-2 Inches #

Bermuda is the dominant grass type across Phoenix, Las Vegas, Dallas, Tampa, and Atlanta. It grows quickly in summer heat and requires at least weekly mowing. On high-input properties in Phoenix during June and July, growth rates can demand service every 5-6 days.

Raise Bermuda from its spring height of 0.5-1 inch to 1.5-2 inches in summer. This extra height reduces heat stress on the crown while keeping the surface within most HOA height limits. Never let Bermuda reach 4 inches between visits. Cutting back to spec in a single pass removes more than a third of the blade, which the height section below covers in full.

Bermuda cut back hard from an overgrown state in one visit will show scalping damage, yellow or brown patches where the crown is exposed. Recovery takes 3-6 weeks in summer heat.

Zoysia: Weekly, Height 1-2 Inches #

Zoysia grows more slowly than Bermuda, but still needs weekly summer mowing. It is more heat- and drought-tolerant, making it common on properties in Dallas and Atlanta with water restrictions.

Keep Zoysia at 1-2 inches throughout the summer. It does not require the same height adjustment as Bermuda, but it still benefits from being kept at the higher end of the range during peak-heat weeks.

St. Augustine: Weekly, Height 3-3.5 Inches #

St. Augustine is the primary grass type on properties in Tampa, Jacksonville, and Orlando. It needs weekly mowing throughout summer and should be kept at 3-3.5 inches. Never cut St. Augustine below 2.5 inches at any time of year.

St. Augustine is more sensitive to scalping than Bermuda. A single low-cut visit to an overgrown St. Augustine lawn can expose stolons and cause visible damage, prolonging recovery into the hottest part of the season. Brief vendors explicitly: 3-3.5 inches, no exceptions.

Cool-Season Grass Mowing in Summer #

Cool-season grasses slow significantly in summer heat. Mowing frequency drops, height goes up, and the priority shifts from growth management to stress reduction.

Tall Fescue: Every 10-14 Days, Height 3.5-4 Inches #

Tall fescue is the dominant grass in Denver, Seattle, and shaded areas of Atlanta. In summer heat above 85-90°F, it slows dramatically and can go dormant in sustained heat above 90°F. Mow every 10-14 days. Weekly mowing removes growth faster than heat-stressed fescue can recover it.

Raise tall fescue to 3.5-4 inches before July. The extra height shades the soil surface, retains moisture, and reduces root zone temperature. In Denver, altitude moderates summer heat enough that fescue rarely goes fully dormant, but it will thin and stress if kept at spring heights through July and August.

Do not fertilize tall fescue in summer. Summer fertilization accelerates heat stress and is not recommended regardless of how the lawn looks.

Kentucky Bluegrass: Every 10-14 Days, Height 3-3.5 Inches #

Kentucky bluegrass goes dormant more readily than tall fescue in sustained heat above 85°F, turning brown while remaining alive. Mow every 10-14 days and keep the height at 3-3.5 inches. Avoid cutting below 3 inches in summer. Shallow cuts combined with drought stress accelerate the onset of dormancy.

Dormant bluegrass should be left alone until temperatures drop and growth resumes. Mowing a fully brown lawn causes additional stress and can damage crowns.

Why Mowing Height Matters More in Summer Than Spring #

On Bermuda lawns in Phoenix, soil temperature in the root zone can differ by 10-15°F depending on whether the canopy is at 1 inch or 2 inches. Raising height in summer is functional, not cosmetic. That temperature difference directly affects root function, drought tolerance, and recovery from missed irrigation cycles.

Taller grass shades the soil surface, which slows moisture evaporation and keeps root zone temperatures manageable through July and August.

The one-third rule is the mechanism connecting height and frequency. A lawn mowed at 1.5 inches should never be cut below 1 inch in a single visit. If a provider falls behind and the lawn reaches 3 inches, cutting back to 1.5 inches in a single visit removes 50% of the blade height, well beyond the one-third threshold. The result is scalping, which shows as yellowed, weakened turf that is more susceptible to heat stress, disease, and weed intrusion.

A 5-day delay in spring is an inconvenience. A 5-day delay in summer on a fast-growing Bermuda lawn can push the next visit into scalping territory.

Common Summer Mowing Mistakes at Rental Properties #

The most common errors we see across our lawn care portfolio work:

• Keeping spring heights through summer. A Bermuda lawn left at 0.5-1 inch through July will show heat stress. Raise heights before June, not in response to visible damage.

• Mowing on a calendar frequency rather than a growth-based one. Biweekly is appropriate for cool-season grasses in summer. It is not appropriate for Bermuda in July in Dallas. Frequency should track growth rate, which accelerates in peak heat months.

• Mowing during peak heat. Mowing between 10 am and 4 pm in Phoenix or Dallas in July adds heat stress to freshly cut grass. Early-morning or late-afternoon mowing reduces that risk.

• Cutting dormant cool-season grass. Wait for dormant grass to resume active growth before resuming a mowing schedule. Cutting too early into dormancy causes additional stress and crown damage.

How to Direct Your Provider on Summer Mowing Schedules #

Providers defaults to the schedule and height they have been running unless directed otherwise. Switching from a spring to a summer schedule requires explicit written instruction.

When briefing a vendor for summer, specify:

• Frequency in days, not just “weekly.” “Every 6-7 calendar days” closes the gap that would otherwise allow 9-10-day intervals to creep in during peak demand periods.

• Height by grass type. State it explicitly in writing: “Bermuda at 1.5-2 inches through September.”

• The one-third rule as a constraint. If a visit is delayed and the grass is too tall for a single cut, require progressive cuts and a follow-up visit rather than a full scalp in one pass.

• Rain-delay protocol. In Dallas and Tampa, afternoon storms disrupt mowing schedules from June through September. Agree on a rescheduling window before the season starts, not during a storm event.

Our guide on recurring landscaping schedules covers how to structure this across a portfolio. Property managers overseeing multiple addresses have found that written confirmation and same-day completion photos at every visit significantly reduce coordination overhead.

Frequently Asked Questions #