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:

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:

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:

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: