Zone 6a Club · Lawn Calendar
Zone 6a Lawn Calendar
Year-round timing tuned to Zone 6a's climate window.
Winter low
-10°F
Last frost
Apr 20
First frost
Oct 15
Season
175d
Primary Overseeding Window
Sep 1 → Oct 10
The single highest-leverage window for cool-season seed in Zone 6a.
Quarter
Spring in Zone 6a
- ▪Mid-late April: pre-emergent crabgrass at soil temp 55°F
- ▪First mow at 4 inches; maintain 3.5 inches
- ▪0.75 lb N/1000 sqft early-mid May
- ▪Spring overseeding (limited, PRG/TTTF) if needed
Quarter
Summer in Zone 6a
- ▪Mow at 3.5–4 inches (taller = more resilient)
- ▪1.5" water per week; deep + infrequent
- ▪Skip July fert; spoon-feed mid-August if irrigated
- ▪Brown patch + summer patch watch — biggest disease month
Quarter
Fall in Zone 6a
- ▪Primary overseeding window: Sep 1 – Oct 10
- ▪1 lb N/1000 sqft early September
- ▪Aerate + overseed compacted areas
- ▪Final mow at 2.5 inches mid-November
Quarter
Winter in Zone 6a
- ▪Light dormancy Dec–February
- ▪Some green weeks in winter mild years
- ▪Plan spring purchases in January
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