How often should you mow your lawn in San Diego?
The short answer: weekly from April through October, every 2-3 weeks November through February, if you have a warm-season grass. Cool-season lawns (fescue) run closer to every 10-14 days in peak growth.
But “how often” is only half the question. The other half is height — and that matters more than most homeowners realize.
Grass types in San Diego County
Most SD lawns fall into one of four categories:
- Bermuda (Bolero, Tifway, hybrid). Warm-season. Dominant inland. Loves heat, goes dormant-ish in winter. Mow at 1.5-2.5 inches.
- St. Augustine (Palmetto, Floratam). Warm-season. Common coastal and partial-shade yards. Mow at 3-4 inches.
- Zoysia (Empire, El Toro). Warm-season. Dense, slow-growing, drought-tolerant. Mow at 1.5-2.5 inches.
- Tall Fescue blends. Cool-season. Holds up in cooler coastal microclimates (Carlsbad, Encinitas, Del Mar). Mow at 2.5-3.5 inches.
If you don’t know what grass you have, look at a single blade in the morning: Bermuda is narrow and pointed, St. Augustine is wide and rounded, Zoysia is stiff and short, Fescue is medium-width with soft tips.
The weekly cadence (April–October)
From April through October, warm-season grasses grow fast enough that weekly mowing is the right baseline. A week’s growth in July is about 1-1.5 inches for Bermuda and 2-2.5 inches for St. Augustine. If you skip to bi-weekly, you end up either cutting off too much at once (stressing the lawn) or letting the grass grow past its healthy height.
The one-third rule is the universal mowing principle: never cut more than one-third of the grass blade in a single pass. If your target height is 2 inches, mow before the grass hits 3 inches. Violate this and the grass pushes out brown tips, stress-sheds water, and invites weeds.
Cool-season fescue grows in pulses. March-June and September-November are peak growth — weekly or every 10 days. July-August it slows in the heat, and bi-weekly is fine. December-February it barely moves; every 3-4 weeks.
Winter slowdown (November–February)
Warm-season grasses go semi-dormant in SD winters. They don’t fully dormant like grasses in colder zones, but growth drops 60-80%. Most yards need mowing every 2-3 weeks, and some lawns can go 3-4 weeks between cuts.
Do not scalp in winter. A common mistake is cutting short in November to “tidy it up for winter.” This exposes the crown of the grass, which then takes longer to green up in spring and is more vulnerable to any freeze. Mow at the normal height, just less often.
Mowing height matters more than cadence
Two lawns mowed on the same weekly schedule can look completely different based on height. Here’s why:
Cut too short (scalping). Warm-season grass at 1 inch or less shocks the root system. The grass pushes more energy into blade recovery than root depth, making it more vulnerable to summer heat. Short lawns also let sunlight reach the soil, which germinates weed seeds. Scalped lawns in June-July in SD are a fast track to a crabgrass summer.
Cut at proper height. Grass at the top of its range shades the soil, keeps root zones cooler, and outcompetes weeds for light. A Bermuda lawn at 2 inches uses roughly 25% less water than the same lawn at 1 inch.
Cut too long. Letting warm-season grass grow past 3 inches creates a thatch layer, matts over in humidity, and then when you finally cut it, you scalp it back. Stay within the range and hold it.
Mowing height cheat sheet
| Grass | Spring | Summer | Fall | Winter |
|---|---|---|---|---|
| Bermuda | 1.5-2” | 2-2.5” | 2” | 1.5-2” |
| St. Augustine | 3-3.5” | 3.5-4” | 3-3.5” | 3” |
| Zoysia | 1.5-2” | 2-2.5” | 2” | 1.5-2” |
| Tall Fescue | 3-3.5” | 3.5-4” | 3-3.5” | 3” |
The pattern: go higher in the summer to shade the soil and protect the crown, slightly lower in spring and winter for cleanup.
Dull blades ruin a good mowing schedule
If your blade is dull, the weekly cadence doesn’t save you. Dull blades tear the grass tips rather than cutting cleanly, which:
- Turns the leaf tips brown within 2-3 days (the “yellow lawn” that waters fine)
- Creates open wounds that invite fungal disease
- Stresses the plant, so it uses more water
Sharpen blades every 10-15 mows (roughly every 8-12 weeks of weekly service). If you’re running your own mower, it’s a $8 sharpening job at any hardware store with a blade bench, or $15 at the shop. Professional crews sharpen weekly.
The “edge, trim, blow” finish
A proper mow is not just the cut. It includes:
- Edging along hardscape (driveway, walkway, bed borders) with a steel-blade edger. This is what makes a yard look finished.
- String trimming around trees, fences, posts, and anywhere the mower can’t reach.
- Blow-off of all hardscape — driveway, walkway, pool deck, patio. Clippings that sit on concrete stain it within a week.
If your current service just mows and leaves, you’re getting a half-job. Every visit on our weekly routes includes all four steps as part of the flat rate.
When to call a pro
DIY mowing works great for yards under 3,000 sq ft where you like the workout. Beyond that, or when the schedule starts slipping past one-week intervals because life gets busy, weekly service makes more sense on the math alone — fuel, blade wear, time, and the difference between a lawn that looks consistently sharp and one that rides the edge of ragged.
Weekly maintenance across San Diego County starts at $120/month for small yards and runs $140-$260 for most single-family properties. Same crew every visit, flat monthly rate, blade sharpening and fuel on us.
Call us at (858) 808-6055 for a free quote. We serve Encinitas, Carlsbad, San Marcos, Escondido, Poway, El Cajon, Chula Vista, and all of San Diego County.