Tohono Chul lawn care, month by month
Arizona 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 | Dormant — keep leaves cleared, stay off frozen turf | Dormant (brown is normal) — no nitrogen, light cleanup only |
| February | Apply crabgrass pre-emergent · Light feeding after green-up | Apply crabgrass pre-emergent |
| 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 | First feeding at full green-up · 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 | Main fall feeding · Winterizer feeding · Final mow of the year | Growth stops — final mow |
| December | Final mow of the year | Growth stops — final mow |
Reading the Tohono Chul lawn year
Transition-zone timing cuts both ways in Tohono Chul: cool-season lawns get their big renovation in early fall (overseed Oct 5 – Oct 20), while warm-season lawns establish in late spring (Mar 12 – Mar 26) and want their last feeding by Oct 9 – Oct 23. The one shared date is the pre-emergent window in spring — both families need crabgrass stopped before soil crosses 55°F.
Grasses that fit Tohono Chul
Frequently asked questions
When should I overseed my lawn in Tohono Chul?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Tohono Chul that means roughly Oct 5 – Oct 20, timed 45–60 days before the average first fall frost (Dec 4) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When should I plant warm-season grass in Tohono Chul?
Seed, sod, or plug Bermuda, Zoysia, and other warm-season grasses in late spring — around Mar 12 – Mar 26 in Tohono Chul, 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 Tohono Chul?
Aim for Feb 5 – Feb 26 — the estimated stretch when Tohono Chul soil approaches the ~55°F germination threshold, anchored to the average last frost (Feb 26). 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 Tohono Chul?
Keep mowing as long as the grass grows — in Tohono Chul that's typically until Nov 27 – Dec 18, around the average first fall frost (Dec 4). Take the final cut slightly shorter to discourage snow mold.
What grass grows best in Tohono Chul?
Arizona 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.