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
Continue at Premium Grass Seeds
Build the fall window before it opens.
Use the calendar for timing, then move through the three buying decisions in order. Start with the zone-filtered seed comparison, then use the matching starter and equipment guides. The seed comparison stays anchored to Zone 5b.
1 · Seed
Compare zone-fit fall seed
Start with overseeding options that list this zone, then confirm the local establishment window.
Open: Compare zone-fit fall seed → (opens in a new tab)2 · Starter
Pair the starter fertilizer
Pick the establishment feed after the seed; it is not a substitute for it.
Open: Pair the starter fertilizer → (opens in a new tab)3 · Equipment
Stage the overseeding tools
Choose the spreader, prep, and watering gear before the window opens.
Open: Stage the overseeding tools → (opens in a new tab)
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