Zone 6b Club · Lawn Calendar
Zone 6b Lawn Calendar
Year-round timing tuned to Zone 6b's climate window.
Winter low
-5°F
Last frost
Apr 15
First frost
Oct 20
Season
185d
Primary Overseeding Window
Sep 5 → Oct 15
The single highest-leverage window for cool-season seed in Zone 6b.
Quarter
Spring in Zone 6b
- ▪Early-mid April: pre-emergent crabgrass at soil temp 55°F
- ▪First mow at 4 inches; maintain 4 inches in 6b for heat resilience
- ▪0.75 lb N/1000 sqft late April–early May
- ▪Spot-overseed freeze-thaw damage with PRG (quick) or TTTF
Quarter
Summer in Zone 6b
- ▪Mow at 4 inches — taller cut buys you 5°F of resilience
- ▪1.5–2" water per week; deep + infrequent; early-morning only
- ▪Skip June–July fert on TTTF (brown patch trigger)
- ▪Brown patch is real — fungicide rotation if you want showcase
Quarter
Fall in Zone 6b
- ▪Primary overseeding window: Sep 5 – Oct 15
- ▪1 lb N/1000 sqft early-mid September (year's most important fert)
- ▪Aerate compacted areas + overseed thin spots
- ▪Final mow at 2.5 inches late November
Quarter
Winter in Zone 6b
- ▪Mostly dormant Dec–February but green weeks in mild years
- ▪Light snow cover, freeze-thaw cycles common
- ▪Plan spring purchases in January
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