Here’s How Short to Cut Grass Before Winter

how short to cut grass in winter

As fall comes to a close and temperatures drop, prepping your lawn for winter becomes essential. One of the most overlooked steps? Mowing. Cutting your grass to the right height before winter can make the difference between a lawn that bounces back in spring — and one that’s patchy, thin, or full of weeds.

Let’s break down how short to cut grass before winter, why it matters, and what to avoid.

What’s the Best Time to Mow in Late Fall?

The best time to perform your final mow is when your grass has nearly stopped growing, typically when daytime highs consistently fall below 50–55°F. For warm-season grasses like Bermuda or Zoysia, this could be late October or early November. For cool-season grasses like fescue or ryegrass, it may be mid to late November.

You want to give your lawn one last cut before it goes fully dormant — but not so early that it continues growing and becomes overgrown by winter.

Not sure when your grass is ready for its final mow? WP Law can help you assess your lawn’s condition and recommend a schedule based on your specific grass type and region.

Signs You’re Cutting Too Short

It’s tempting to go lower on your last mow, but cutting more than one-third of the blade height can cause shock. Common signs you’ve gone too short include:

  • Browning or yellowing tips
  • Patchy or uneven growth
  • Slower regrowth in spring
  • Increased weed invasion or bare spots

As a rule of thumb:

  • Cool-season grass: Final mow height should be 2.5–3 inches
  • Warm-season grass: Final mow height should be 1.5–2 inches

These heights protect the grass crown while preventing matting or moisture buildup over winter.

Does Mowing Frequency Change in Fall?

Yes — grass growth slows down as days get shorter and temperatures drop. While you may mow weekly in summer, fall mowing typically drops to every 10–14 days. Pay attention to growth, not the calendar. The goal is to avoid scalping the lawn or letting it grow too tall before winter.

You’ll also want to keep mower blades sharp and avoid mowing when the grass is wet or frosty, which can damage the turf and compact the soil.

Protect Your Lawn Now for a Greener Spring

Maintaining the right lawn height before winter helps set the stage for a healthy, green spring. If you’re unsure about when to cut, how short to mow, or whether your lawn needs additional prep like fertilizing or overseeding, WP Law’s team is here to help. We provide seasonal lawn care guidance and irrigation support tailored to your grass type and region.

Ready to prep your yard for winter? Connect with WP Law for expert advice and service you can count on.

5 Tips for Winter Irrigation in 2025

Winter can do serious damage to irrigation systems if they’re not properly prepared. Whether you manage a commercial property or maintain a residential lawn, ignoring winter prep could result in cracked pipes, burst valves, and costly spring repairs.

These five expert tips will help you prepare your system for cold weather and ensure your irrigation setup stays protected through winter and ready for spring.

Why Winterizing Irrigation Is Essential

Cold weather can cause water to freeze and expand — so any moisture left inside pipes or valves can lead to broken pipes, valves, and pump casings. Even in mild climates, freezing temperatures can sneak in unexpectedly and wreak havoc on unprotected irrigation systems.

Winterizing ensures:

  • Pipes are empty and safe from freezing
  • Valves and fittings stay intact
  • Your system will restart smoothly in the spring

Skipping this step could result in extensive repairs or full system replacements.

Tools You Need for a Proper Irrigation Blowout

The most effective way to winterize your system is with a sprinkler blowout, which uses compressed air to remove all remaining water. Here’s what you’ll need:

  • Air compressor (preferably with at least 80–100 CFM)
  • Sprinkler blowout valve or quick-connect fitting
  • Eye and ear protection
  • Timer override or manual zone activation

If you’re not comfortable doing it yourself, consider hiring a professional. Improper blowouts can cause more harm than good, especially if the pressure is too high.

Not sure if you have the right equipment or pressure settings? WP Law can recommend someone who provides professional irrigation blowout services to ensure your system is winterized safely and thoroughly.

When to Shut Off Your Irrigation System

The ideal time to shut off your system is just before your region’s first expected hard freeze. For many areas in the Southeast, that’s late October to early November.

Steps to take:

  • Turn off the water supply to the system
  • Power down the controller or timer
  • Manually open drain valves, if present
  • Run a blowout, even after draining, to remove hidden moisture

Being proactive can help you avoid a last-minute scramble when freezing temps arrive overnight.

What to Know About Sprinkler Blowout Valves

A sprinkler blowout valve gives you access to the irrigation line so you can safely attach an air compressor. If your system doesn’t have one, it may be worth installing — especially for commercial or multi-zone setups.

Important reminders:

  • Never exceed 50–80 PSI during blowouts
  • Always open one zone at a time to prevent pressure buildup
  • Avoid using shop compressors (they often lack the needed volume)

Using the right equipment ensures a thorough, safe winterization process. If your system doesn’t have a blowout valve or you’re unsure how to use one correctly, WP Law can evaluate your setup and recommend the right upgrades to make future maintenance easier.

Common Winter Irrigation Mistakes to Avoid

Even experienced property owners can make mistakes when winterizing their system. Watch out for these common errors:

  • Leaving water in low spots or backflow preventers
  • Skipping the blowout step
  • Forgetting to shut down timers or controllers
  • Waiting too long to act — aka, after the first freeze has hit

Getting ahead of the cold and following a proven winterization checklist will help you avoid costly surprises in spring.

Schedule Your Winter Irrigation Service

Winter can be tough on irrigation systems, but a little preparation now can save a lot of trouble later. If you’re unsure about how to properly blow out your system or want expert help with winterization, the team at WP Law is ready to assist. From residential systems to large-scale commercial setups, we’ll make sure your irrigation is protected and primed for a smooth spring startup.

Reach out today to schedule your winter service.

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