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ZONE 6BCLUBPREMIUM GRASS SEEDSEST. 2026

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 5Oct 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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