Zone 5b Club · Lawn Calendar
Zone 5b Lawn Calendar
Year-round timing tuned to Zone 5b's climate window.
Winter low
-15°F
Last frost
Apr 25
First frost
Oct 10
Season
165d
Primary Overseeding Window
Sep 1 → Oct 5
The single highest-leverage window for cool-season seed in Zone 5b.
Quarter
Spring in Zone 5b
- ▪Early May: overseed winter damage
- ▪First mow at 4 inches; maintain 3.5 inches
- ▪0.75 lb N/1000 sqft early May
- ▪Pre-emergent at soil temp 55°F (late April)
Quarter
Summer in Zone 5b
- ▪Mow at 3.5–4 inches (taller = more heat resilience)
- ▪1.5" water per week; deep + infrequent
- ▪Skip July fert; spoon-feed in mid-August if irrigated
- ▪Brown patch + summer patch watch
Quarter
Fall in Zone 5b
- ▪Primary overseeding: Sep 1 – Oct 5
- ▪1 lb N/1000 sqft early September
- ▪Aerate and overseed compacted areas
- ▪Final mow at 2.5 inches early November
Quarter
Winter in Zone 5b
- ▪Mostly dormant Dec–March
- ▪Light snow-cover most years
- ▪Order seed January
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