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When to Plant Thyme in Lamoille County, VT

Thyme is a low-growing perennial herb with tiny, aromatic leaves and a warm, earthy flavor. It is one of the most versatile culinary and medicinal herbs.

Lamoille County, Vermont is in USDA Zone 4a. The average last spring frost is May 8 and the first fall frost is October 6, giving you a growing season of approximately 151 days.

At an elevation of 823 feet, Lamoille County receives approximately 46.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83ยฐF, so choose short-season varieties of Thyme to ensure they mature before fall.

Lamoille County, VT (Zone 4a) Moderate season
151 days
Last Spring Frost May 8
151 growing days
First Fall Frost October 6

Lamoille County Soil Profile

Soil Type

Silt Loam

Soil pH

4.9-6.4

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (11 days to spare)
Transplant: May 11 🍅 Harvest: Jul 20 – Sep 21
Recommended (50%) ✓ Fits season (11 days to spare)
Transplant: May 15 🍅 Harvest: Jul 24 – Sep 25
Safe Start (90%) ✓ Fits season (9 days to spare)
Transplant: May 31 🍅 Harvest: Aug 9 – Oct 11

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.

Soil Compatibility in Lamoille County

How your county's soil matches Thyme's growing requirements.

Soil pH

Your soil pH (4.9โ€“6.4) is more acidic than Thyme prefers (6.0โ€“8.0). Add garden lime to raise pH.

Soil Texture

The silt loam soil in Lamoille County is excellent for Thyme โ€” good drainage, moisture retention, and nutrient holding capacity.

Organic Matter

Organic matter is moderate (3.6%). Annual compost additions will help Thyme.

How to Plant Thyme

0.5"
Planting Depth
8"
Between Plants
12"
Between Rows

Succession Planting Thyme

2
successive plantings in your 151-day season

Sow every 8 weeks. Last sowing by Jul 08 to harvest before frost.

Plant Water Budget

Plant needs
0.3″/week
Rainfall provides
1.3″/week
Watering frequency Natural rainfall sufficient
Season total 0 gal / 100 sq ft
Thyme needs ~980 GDD — county provides 1,849 GDD Excellent fit

Thyme Planting Timeline โ€” Lamoille County, VT

Thyme Planting Calendar

Activity When Date Range
Transplant Outdoors May 15 May 15 โ€“ May 29
Harvest July 24 Jul 24 โ€“ Sep 25

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

Month-by-Month Timeline

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

Growing Conditions

โ˜€๏ธ Sun

Full Sun (6-8+ hours)

๐Ÿ’ง Water

0.3"/week ยท Natural rainfall sufficient

๐Ÿ“… Days to Maturity

70โ€“90 days

๐Ÿงช Soil pH

Needs 6โ€“8 ยท Your soil: too_acidic

๐Ÿ—บ๏ธ USDA Zone

Zone 4a

๐Ÿ“† Growing Season

151 days in Lamoille County

Growing Tips for Thyme in Lamoille County

Direct sow Thyme outdoors after May 08 in Lamoille County when soil has warmed and frost danger has passed.

General growing tips

Start from seed, cuttings, or divisions. Plant in well-drained, lean soil. Prune lightly after flowering. Replace plants every 3-4 years when they become woody.

Companion Planting

Good Companions

Level Up Your Garden

Frequently Asked Questions

When should I plant Thyme in Lamoille County, VT?

Lamoille County is in Zone 4a with an average last frost of May 8. Plan your Thyme planting based on this frost date โ€” see the calendar above for exact timing.

What planting zone is Lamoille County, VT?

Lamoille County, Vermont is in USDA Hardiness Zone 4a. The average last spring frost is May 8 and first fall frost is October 6.

๐ŸŒฑ

Plan Your Garden with Confidence

Get our free Garden Planner โ€” designed to help Lamoille County gardeners in Zone 4a organize planting dates, track what's growing, and never miss a planting window.

Get Your Free Garden Planner →

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 Lamoille County, VT. Local conditions may vary. Last updated: April 2026.