How Often Should You Mow Your Lawn?

How Often Should You Mow Your Lawn? A Seasonal Guide From Vancouver, WA Landscapers

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"How often should I mow my lawn?"

It sounds like a simple question, but the answer changes depending on the season, your grass type, the weather, and what you're actually trying to achieve with your yard. Get it wrong in either direction — mowing too often or not often enough — and you end up with a lawn that looks stressed, patchy, or overrun with weeds.

At Campos Landscaping, we maintain lawns across Vancouver, WA and Clark County every week, and one pattern we see repeatedly is homeowners sticking to the same rigid mowing schedule year-round. Every Saturday at 10 AM, rain or shine, whether the grass needs it or not. That approach feels disciplined, but it actually works against your lawn's health. Grass doesn't grow on a calendar — it grows based on temperature, moisture, sunlight, and soil conditions. Your mowing schedule should follow the grass, not the other way around.

This guide breaks down exactly how often to mow based on the season, what height to maintain, and why the details matter more than most people realize.

THE ONE RULE THAT MATTERS MOST

Before we get into seasonal schedules, there's one principle that professional landscapers treat as non-negotiable: the one-third rule.

Never remove more than one-third of the grass blade height in a single mowing.

That means if you're maintaining your lawn at 3 inches, you should mow before it reaches 4.5 inches — not when it hits 6 inches and looks like a meadow. Research from university turf programs, including Michigan State University Extension, consistently shows that removing more than one-third of the leaf surface at once shocks the grass plant, weakens the root system, and reduces the lawn's ability to photosynthesize and recover.

Here's why this matters practically: if you skip two weeks of mowing during a rainy spring stretch and your grass shoots up to 7 inches, you can't just scalp it back to 3 inches in one pass. You'll need to take it down gradually over two or three mowings. Patience prevents damage.

The University of Maryland Extension puts it plainly: mowing to the proper height can reduce weeds and diseases by 50% to 80% in common grass types. That's not a minor benefit — that's the difference between a lawn that looks good and one that's constantly fighting problems.

HOW OFTEN TO MOW BY SEASON IN VANCOUVER, WA

The Pacific Northwest climate creates a unique mowing calendar compared to other parts of the country. Here in Clark County, we deal with mild, wet winters, cool springs with rapid growth, warm (but not scorching) summers, and extended rainy falls. Here's how that translates to mowing frequency.

Spring (March through May)

Spring is when your lawn wakes up and grows aggressively. Cool-season grasses — which dominate Pacific Northwest lawns, including perennial ryegrass, tall fescue, and Kentucky bluegrass — thrive in the 60°F to 75°F range. In Vancouver, WA, that means growth accelerates in March and hits peak speed in April and May.

Mowing frequency: Every 5 to 7 days, sometimes twice per week during rainy, warm stretches in late April and May.

Recommended height: 3 to 3.5 inches.

This is the season where most homeowners fall behind. Rain delays mowing, the grass grows 2 inches in a week, and suddenly you're violating the one-third rule every time you mow. If you can only take one piece of advice from this article, it's this: don't let spring get away from you. Consistent mowing in spring sets the tone for the entire year.

Summer (June through August)

Summer in the Pacific Northwest is drier and warmer than most people outside the region realize. Once the rain stops in late June, lawns can become stressed from heat and reduced moisture. Grass growth slows considerably.

Mowing frequency: Every 7 to 10 days, depending on whether you're irrigating.

Recommended height: 3.5 to 4 inches. Raise your mowing height in summer — taller grass shades the soil, retains moisture, and develops deeper roots.

Professional insight: This is the season where we see the most damage from homeowners mowing too short. Scalping the lawn during summer heat is one of the fastest ways to create brown patches, invite crabgrass, and stress the root system. If your lawn looks a little "shaggy" in July, that's actually a sign it's protecting itself. Work with it, not against it.

Fall (September through November)

Fall is the second growth surge for cool-season grasses. As temperatures cool and the rains return, your lawn rebounds and starts growing actively again. This is also the ideal time for overseeding, fertilizing, and aeration — which means your mowing schedule matters for the success of those treatments too.

Mowing frequency: Every 5 to 7 days in September and October, tapering to every 10 to 14 days in November as growth slows.

Recommended height: 3 to 3.5 inches, then gradually lower to about 2.5 inches for the final mow of the season. Cutting slightly shorter for the last mow reduces the risk of snow mold and matting over the winter.

Fall is also the best time to mulch-mow fallen leaves into the lawn rather than raking them. A couple of passes with the mower breaks leaves into small pieces that decompose quickly and return nutrients to the soil. Michigan State University Extension research confirms this is both effective and beneficial for soil health.

Winter (December through February)

In most of the Pacific Northwest, grass doesn't go fully dormant in winter. It grows very slowly — sometimes barely at all — but it rarely stops completely in our mild climate.

Mowing frequency: Rarely to never. You may need one or two light mowings in December or February if growth continues during mild stretches.

Recommended height: Don't mow below 3 inches. If the lawn doesn't need it, leave it alone. Mowing wet, cold turf can compact the soil, tear grass blades, and spread disease.

MOWING HEIGHT MATTERS MORE THAN YOU THINK

Most homeowners focus on mowing frequency but overlook mowing height — and height is arguably more important. Here's why:

Taller grass develops deeper roots. There's a direct, measurable relationship between blade height and root depth. A lawn mowed at 3.5 inches will have a significantly deeper root system than one mowed at 2 inches. Deeper roots mean better drought tolerance, better nutrient absorption, and a more resilient lawn overall.

Taller grass shades out weeds. Crabgrass and other common weeds need sunlight to germinate. When your lawn is thick and tall enough to shade the soil surface, weed seeds don't get the light they need to establish. Ohio State University Extension research confirms that proper mowing height directly reduces weed populations.

Taller grass retains soil moisture. Especially important during our dry Pacific Northwest summers, taller grass acts as a living mulch, keeping the soil cooler and reducing evaporation.

Here's a quick reference for common Pacific Northwest grass types:

• Perennial Ryegrass: 2.5 to 3.5 inches
• Tall Fescue: 3 to 4 inches
• Kentucky Bluegrass: 2.5 to 3.5 inches
• Fine Fescue: 2.5 to 3.5 inches

If you're not sure what type of grass you have, a safe default for Vancouver, WA lawns is 3 to 3.5 inches.

5 COMMON MOWING MISTAKES WE SEE EVERY WEEK

After maintaining lawns across Clark County for years, here are the mistakes we see most often — and they're all fixable.

1. Mowing on a fixed schedule instead of watching the grass. Your lawn doesn't know it's Saturday. Mow when the grass needs it, which means watching its height rather than your calendar.

2. Cutting too short ("scalping"). This is the single most damaging mowing practice. It weakens roots, stresses the plant, and opens the door for weeds and disease. If your mower is set to its lowest setting, raise it.

3. Mowing with dull blades. Dull blades tear grass rather than cutting it cleanly. Torn grass tips turn brown, become entry points for disease, and give the lawn a ragged appearance. Sharpen blades at the start of each season and every 4 to 6 weeks during active mowing.

4. Mowing wet grass. It clumps, clogs your mower, cuts unevenly, and can spread fungal diseases across the lawn. Wait until the grass is dry. In the Pacific Northwest, this sometimes means mowing on Tuesday evening instead of Saturday morning.

5. Bagging clippings unnecessarily. Unless you've let the grass get extremely long and clippings are smothering the lawn, leave them. Grass clippings decompose rapidly and return valuable nitrogen and nutrients to the soil. University research consistently shows that returning clippings can reduce fertilizer needs significantly — some studies suggest it's equivalent to one full fertilizer application per season.

SHOULD YOU MOW YOUR OWN LAWN OR HIRE A PROFESSIONAL?

Let's be straightforward: for a standard-sized lawn with basic needs, most homeowners are perfectly capable of mowing their own grass. It's not complicated work, and if you follow the principles in this article — proper height, proper frequency, sharp blades, don't mow wet — you'll get good results.

Professional lawn maintenance makes more sense when:

• You don't have the time or physical ability to mow consistently. A lawn that gets mowed every two weeks when it should be mowed weekly will always look worse than one on a proper schedule. Consistency is the key variable.

• Your lawn has specific challenges. Slopes, drainage issues, mixed grass types, persistent weed problems, or large properties all benefit from professional knowledge and equipment.

• You want the full picture. Mowing is just one piece of lawn health. Fertilization timing, aeration, overseeding, irrigation adjustments, and seasonal cleanups all work together. A professional service coordinates all of these into a program rather than treating each task in isolation.

• You'd rather spend your weekends doing something else. That's a perfectly valid reason. Time has value.

FREQUENTLY ASKED QUESTIONS

How often should I mow my lawn in Vancouver, WA?

During peak growing season (April through June and September through October), mow every 5 to 7 days. In summer, every 7 to 10 days. In late fall and winter, rarely to never. Always base frequency on grass height, not the calendar.

What height should I cut my grass?

For most Pacific Northwest lawns, maintain a height of 3 to 3.5 inches. Raise to 3.5 to 4 inches in summer. Lower slightly to 2.5 inches for the final mow of fall.

Is it bad to mow every day?

For most home lawns, yes — it's unnecessary and can compact the soil from repeated mower traffic. However, robotic mowers that cut small amounts frequently (the "little and often" approach) can work well because they remove minimal blade length per pass.

Should I bag my grass clippings?

In most cases, no. Leave clippings on the lawn (called "grasscycling"). They decompose quickly and return nutrients to the soil. Only bag clippings if the grass was severely overgrown and large clumps are smothering the lawn.

When should I stop mowing for the winter?

In Vancouver, WA, the final mow typically happens in late November or early December. Cut slightly shorter than usual (about 2.5 inches) to reduce the risk of snow mold and matting during winter.

Can mowing wrong actually damage my lawn?

Absolutely. Scalping (cutting too short) weakens roots and invites weeds. Mowing with dull blades tears grass and creates disease entry points. Mowing wet grass spreads fungal problems. Proper mowing technique has a bigger impact on lawn health than most people realize.

VANCOUVER, WA LAWNS DESERVE BETTER THAN GUESSWORK

Every lawn in Clark County is different. Soil conditions, sun exposure, grass type, drainage, and how much foot traffic the lawn receives all factor into the ideal mowing approach. The schedules and heights in this guide will serve most homeowners well, but if your lawn has specific challenges — persistent bare spots, heavy shade, drainage issues, or weed problems that won't go away — sometimes a professional assessment is the fastest path to answers.

At Campos Landscaping, we provide lawn care and maintenance services throughout Vancouver, WA and Clark County. Whether you need weekly mowing, seasonal cleanup, or a comprehensive lawn care plan, we bring the same attention to detail to every property we maintain.

If you have questions about your lawn or want to discuss a maintenance plan, give us a call at 360-842-1568 or visit camposlandscapingvancouver.com for a free consultation.

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What's the lawn care task you always put off until it's too late? Mowing after a long rainy stretch? Sharpening your blades? Let me know in the comments.

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Written by the Campos Landscaping Team | Vancouver, WA
camposlandscapingvancouver.com | 360-842-1568