When to Start Mowing Your Lawn in Colorado (2026 Guide)

Pink Flamingo Lawn Service is a locally owned lawn care company based in Arvada, Colorado, serving homeowners throughout the Front Range. One of the most common questions we get every spring is: when should I start mowing my lawn in Colorado? The short answer is April — but only once the soil temperature has consistently reached 55°F and your grass has resumed active growth. Jumping the gun by even two or three weeks can stress your lawn and set back recovery. This guide walks you through everything you need to know about the mowing season in Arvada, Denver, and Golden.

Colorado's Growing Season by Month

Understanding what's happening with your lawn each month is the foundation of a proper mowing schedule on the Front Range. Here's a breakdown of what to expect from March through November:

How Altitude Affects Your Mowing Schedule

Colorado's Front Range is not a flat, uniform climate. The altitude differences between communities mean that mowing season can vary by several weeks depending on where you live. Arvada sits at approximately 5,500 feet above sea level, which means spring soil temps warm a bit earlier than communities further west. Golden, at 5,675 feet, sits slightly higher and tends to experience cooler spring temperatures for a few weeks longer than the lower parts of the metro area.

Denver proper, at around 5,280 feet, is sometimes the first to warm in late March or early April — but even here, mowing before the soil reaches 55°F consistently will do more harm than good. The cool overnight temperatures that persist into late April at all Front Range elevations mean grass blades that are cut too early are more susceptible to freeze damage the following night.

Signs Your Lawn Is Ready for the First Mow

Beyond soil temperature, your lawn will give you clear physical signals that it's ready for that first mow of the season. Look for all three of these before getting the mower out of the garage:

• Grass height of 3.5 to 4 inches: You want a full inch above the target cut height of 3 inches before mowing. Never cut more than one-third of the blade at once.
• Active, upright growth: Dormant grass may be green but flat or lying sideways from winter snow. Actively growing grass is upright and visibly reaching upward.
• Firm, dry soil: If the ground is soft and soggy from snowmelt or spring rain, wait. Mowing wet or muddy lawns compacts the soil, ruts the turf, and can tear out root systems that are still shallow from winter.

Mowing Frequency Through the Season

Frequency varies as the season progresses and grass growth rates change with temperature and moisture. Here's how to think about it throughout the year:

• Late April through May: Begin with every 10–14 days as growth is just picking up, then shift to weekly once active growth is established.
• June through early September: Weekly mowing is standard for most Front Range lawns. During particularly wet stretches you may need to mow every 5–6 days.
• Mid-September through October: As overnight temperatures drop below 50°F, growth slows significantly. Shift to bi-weekly mowing.
• November: Make one final mow at a slightly lower height (2.5 to 3 inches) before dormancy to reduce the risk of snow mold over winter.

Cool-Season vs. Warm-Season Grasses in Colorado

The vast majority of Front Range lawns are planted with cool-season grasses — primarily Kentucky bluegrass and tall fescue. These grasses thrive in Colorado's spring and fall conditions, with optimal growth between 60°F and 75°F. They go semi-dormant during summer's peak heat and become fully dormant once overnight temperatures consistently drop below freezing in November.

A smaller number of properties, particularly in lower-elevation, more sun-exposed areas of Denver and the Denver suburbs, have warm-season grasses like buffalograss or blue grama. These native Colorado grasses don't green up until soil temps reach 65–70°F — often mid-May — and should be mowed on a much less frequent schedule at lower heights (1.5 to 2.5 inches).

If you're not sure which type of grass you have, our team at Pink Flamingo can identify your turf type during a free quote visit. We tailor every lawn mowing service to the specific grass variety on your property.

Common Mowing Mistakes to Avoid

Even homeowners who know when to start mowing often fall into habits that damage their lawns over the season. Here are the most common mistakes we see on Front Range properties:

• Mowing too early in spring: Starting before soil temps reach 55°F stresses roots and leaves grass vulnerable to late spring frosts. One impatient mow can set your lawn back by two to three weeks.
• Cutting too short ("scalping"): Colorado homeowners sometimes try to mow less frequently by cutting very low — this removes the photosynthesizing leaf tissue and sends the lawn into stress. Keep your blade at 3 inches minimum through the season.
• Mowing wet grass: After a Colorado afternoon thunderstorm, wait at least 24 hours before mowing. Wet grass clumps, clogs your mower deck, and creates uneven cut patterns that promote disease.
• Skipping the final fall mow: Leaving grass too long over winter creates habitat for snow mold, voles, and fungal disease. A final cut at 2.5 inches in late October or early November prepares your lawn for a healthy spring.
• Using dull mower blades: Dull blades tear grass rather than cutting it cleanly, leaving ragged brown tips and creating entry points for disease. Sharpen or replace blades at least once per season, preferably twice.

Professional Lawn Mowing vs. DIY in Colorado

Many homeowners love the ritual of mowing their own lawn. But as schedules get busier — and Colorado's summer thunderstorm season makes consistent mowing harder to predict — a professional service ensures your lawn gets cut at the right height, at the right frequency, with equipment that's properly maintained.

Our weekly lawn care service includes mowing at the correct seasonal height, edging along all hard surfaces, and blowing clippings from driveways and sidewalks. We keep meticulous records of each visit so we can adjust frequency if your lawn is growing unusually fast or slow.

We also coordinate mowing timing with our fertilization programs and seasonal cleanups so your lawn care plan is integrated — not piecemeal. And when it comes to service areas, we cover all of Arvada, most of Denver, and Golden.

Summary: When to Start Mowing in Colorado

To recap the key points for Front Range homeowners:

• Begin mowing when soil temperature consistently reaches 55°F — typically late April in Arvada and Denver, and early May in Golden and higher elevations.
• Wait until grass is 3.5 to 4 inches tall and actively growing before the first mow.
• Mow weekly from May through early September, then bi-weekly through October.
• Make one final mow at 2.5–3 inches before winter dormancy in November.
• Never cut more than one-third of the grass blade at once.
• Keep your mowing blade at 3 inches minimum throughout the growing season.