San Diego lawn care, month by month
California sits in the turf transition zone, so the calendar depends on which grass family you have — they run on opposite schedules. Cool-season lawns (tall fescue, bluegrass) peak in spring and fall; warm-season lawns (Bermuda, Zoysia) do everything in the warm half. Not sure which you have? Start with the grass identification guides.
| Month | Cool-season lawns | Warm-season lawns |
|---|---|---|
| January | Apply crabgrass pre-emergent · Final mow of the year | Apply crabgrass pre-emergent |
| February | Apply crabgrass pre-emergent · Light feeding after green-up | Apply crabgrass pre-emergent · Seed, sod, or plug new grass |
| March | Light feeding after green-up | Seed, sod, or plug new grass · First feeding at full green-up · Aerate / dethatch |
| April | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Aerate / dethatch |
| May | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Peak growth — regular mowing, about 1″ of water a week |
| June | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Peak growth — regular mowing, about 1″ of water a week |
| July | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Peak growth — regular mowing, about 1″ of water a week |
| August | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Peak growth — regular mowing, about 1″ of water a week |
| September | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat | Peak growth — regular mowing, about 1″ of water a week |
| October | Aerate + overseed · Main fall feeding | Last nitrogen of the year |
| November | Aerate + overseed · Main fall feeding · Winterizer feeding | Last nitrogen of the year |
| December | Winterizer feeding · Final mow of the year | Growth stops — final mow |
Reading the San Diego lawn year
Transition-zone timing cuts both ways in San Diego: cool-season lawns get their big renovation in early fall (overseed Oct 21 – Nov 5), while warm-season lawns establish in late spring (Feb 24 – Mar 10) and want their last feeding by Oct 25 – Nov 8. The one shared date is the pre-emergent window in spring — both families need crabgrass stopped before soil crosses 55°F.
Grasses that fit San Diego
Frequently asked questions
When should I overseed my lawn in San Diego?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in San Diego that means roughly Oct 21 – Nov 5, timed 45–60 days before the average first fall frost so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When should I plant warm-season grass in San Diego?
Seed, sod, or plug Bermuda, Zoysia, and other warm-season grasses in late spring — around Feb 24 – Mar 10 in San Diego, once soil has warmed well past the last frost. That gives new grass a full growing season to mature before its first winter dormancy.
When do I put down crabgrass preventer in San Diego?
Aim for Jan 20 – Feb 10 — the estimated stretch when San Diego soil approaches the ~55°F germination threshold. It's an estimate: a soil thermometer reading 50–55°F at 2″ depth for several days is the precise trigger, and pre-emergent must go down before crabgrass sprouts, not after.
When should I stop mowing in San Diego?
San Diego lawns grow essentially year-round — mowing never fully stops, it just slows in the cooler months. Keep cutting whenever the grass is actively growing.
What grass grows best in San Diego?
California is in the turf transition zone, so both families are common: Tall fescue and Kentucky bluegrass alongside Bermuda and Zoysia. Tall fescue is the usual cool-season pick and Bermuda or Zoysia the warm-season ones — they run on opposite calendars, so identify what you have first. See the grass guides linked below for identification and care.