Kentucky Bluegrass Care Calendar
Month-by-month care schedule for Kentucky Bluegrass lawns. Fertilizer, thatch management, overseeding, and disease prevention — timed to your season.
October
Fall nitrogen is the most efficient feeding of the year — KBG stores carbohydrates in its rhizomes for winter survival and early spring green-up. If you overseeded in September, skip pre-emergent in those areas.
Full Year Calendar
Every task, every month. Tap a month to see what's on the schedule.
January
KBG is dormant. Great time to get a soil test — results take 2-3 weeks and guide spring inputs.
February
Still dormant. Apply lime/sulfur now so it has time to adjust pH before active growth. Target pH 6.0-7.0 for KBG.
March
Pre-emergent timing is critical. Apply BEFORE soil hits 55°F — the product needs activation time before crabgrass germinates. If you plan to overseed in spring, skip pre-emergent in those areas (it blocks grass seed too).
April
KBG greens up as soil temps reach 50°F+. Wait until active growth before first nitrogen — feeding dormant turf wastes fertilizer and feeds weeds. Do NOT aerate now: NC State says "Delay aeration until fall" for cool-season turf in both spring and summer. Fall is the only recommended window.
May
KBG produces significant thatch due to its rhizome growth. Check thatch depth now, but do the work in fall — dethatch in September alongside core aeration, when KBG is growing hard and recovers fastest. Spring cultivation on cool-season turf runs into summer stress before it has healed.
June
As heat increases, raise the mowing height. Taller blades shade the soil, keep roots cooler, and reduce water loss. Heavy nitrogen in summer heat promotes disease — use iron for color instead.
July
July-August is peak stress for KBG in transition zones. The grass may thin or brown — this is normal heat dormancy. Do NOT push growth with heavy nitrogen. If you water through summer, commit fully — partial watering is worse than letting it go dormant.
August
Late August is when grub damage shows up — brown patches that peel back like carpet. Check now so you can treat before fall seeding. September is the most important month for KBG — start planning now.
September
PRIME TIME for KBG. This is the single most important month — aerate, overseed, and fertilize now. KBG germinates slowly (14-28 days), so mixing with perennial ryegrass (which germinates in 5-7 days) gives quick cover while KBG establishes. Soil temps above 50°F are ideal for germination.
October
Fall nitrogen is the most efficient feeding of the year — KBG stores carbohydrates in its rhizomes for winter survival and early spring green-up. If you overseeded in September, skip pre-emergent in those areas.
November
Winterizer is the most important single fertilizer application of the year. Apply after top growth stops but before the ground freezes. Lower the final mow height to reduce snow mold risk. Leaf removal is critical — matted leaves smother KBG and promote disease.
December
KBG is dormant. Clean up any remaining leaves to prevent snow mold. Store equipment properly and sharpen blades for spring.
Quick Reference
Mowing Height
2.5-3.5"
Dormant when ground freezes. Green-up at 45°F air temp.
Watering
1-2 times per week, increase to 2 times per week in summer heat
0.5-0.75 inches per session (1-1.5 inches total per week) per session. KBG will go dormant in extended drought (turns brown) but recovers when moisture returns. If you choose to water through summer, commit fully — partial watering is worse than letting it go dormant. Water early morning only to reduce disease pressure.
Fertilizer Program
2-4 lb N/1K sqft/year
Soil pH target: 6.0-7.0
Pests & Weeds to Watch
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See the full Cool Season CalendarFrequently Asked Questions
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