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When to Plant Lemon Thyme in Westchester County, NY

Lemon thyme is a low-growing perennial herb with tiny, citrus-scented leaves. It combines the savory quality of thyme with a bright lemon flavor, excellent with fish and poultry.

Westchester County, New York is in USDA Zone 6b. The average last spring frost is March 29 and the first fall frost is November 12, giving you a growing season of approximately 228 days.

At an elevation of 547 feet, Westchester County receives approximately 38.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91ยฐF, providing good warmth for Lemon Thyme during the growing season.

Westchester County, NY (Zone 6b) Long season
228 days
Last Spring Frost March 29
228 growing days
First Fall Frost November 12

Westchester County Soil Profile

Soil Type

Silt Loam

Soil pH

4.8-6.7

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (88 days to spare)
Transplant: Apr 1 🍅 Harvest: Jun 10 – Aug 12
Recommended (50%) ✓ Fits season (88 days to spare)
Transplant: Apr 5 🍅 Harvest: Jun 14 – Aug 16
Safe Start (90%) ✓ Fits season (97 days to spare)
Transplant: Apr 16 🍅 Harvest: Jun 25 – Aug 27

Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.

Plant Water Budget

Plant needs
0.5″/week
Rainfall provides
0.7″/week
Watering frequency Natural rainfall sufficient
Season total 0 gal / 100 sq ft
Lemon Thyme needs ~1,460 GDD — county provides 4,161 GDD Excellent fit

Lemon Thyme Planting Timeline โ€” Westchester County, NY

Lemon Thyme Planting Calendar

Activity When Date Range
Transplant Outdoors April 5 Apr 5 โ€“ Apr 19
Harvest June 14 Jun 14 โ€“ Aug 16

Plant 0.5" deep ยท 8" apart ยท Rows 12" apart

Month-by-Month Timeline

MonthActivities
January โ€”
February โ€”
March โ€”
April Transplant Outdoors
May โ€”
June Harvest
July Harvest
August Harvest
September โ€”
October โ€”
November โ€”
December โ€”

Growing Conditions

Sun

Full Sun (6-8+ hours)

Water

Low โ€” drought tolerant

Days to Maturity

70โ€“90 days

Soil pH

6 โ€“ 8

USDA Zone

Zone 6b

Growing Season

228 days

Growing Tips for Westchester County

Start from cuttings or divisions. Plant in well-drained soil. Trim back after flowering. Use as a fragrant ground cover or edging plant along garden paths.

Companion Planting

Good Companions

Level Up Your Garden

Frequently Asked Questions

When should I plant Lemon Thyme in Westchester County, NY?

Westchester County is in Zone 6b with an average last frost of March 29. Plan your Lemon Thyme planting based on this frost date โ€” see the calendar above for exact timing.

What planting zone is Westchester County, NY?

Westchester County, New York is in USDA Hardiness Zone 6b. The average last spring frost is March 29 and first fall frost is November 12.

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Plan Your Garden with Confidence

Get our free Garden Planner โ€” designed to help Westchester County gardeners in Zone 6b organize planting dates, track what's growing, and never miss a planting window.

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Free download. Plan your entire garden season in minutes.

Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Westchester County, NY. Local conditions may vary. Last updated: April 2026.