When to plant Thyme in Mc Lean,
In Mc Lean, Thyme is a spring-only crop. Plant April 25–May 9 once soil hits 50°F.
When to Plant Thyme in Mc Lean, IL
Mc Lean, IL gardeners: here's your June plan
Your garden in Mc Lean, IL is working on a schedule, even when you're not. Here's where you should be this June.
Coming up in July — start thinking about
- First harvests: thyme
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.
Mc Lean, Illinois is in USDA Zone 6a. The average last spring frost is April 18 and the first fall frost is October 18, giving you a growing season of approximately 183 days.
At an elevation of 1,024 feet, McLean County receives approximately 31.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86°F, providing good warmth for Thyme during the growing season.
Mc Lean Soil Profile
Soil Type
Silt Loam
Soil pH
6-7
Drainage
Well Drained
Thyme Planting Risk Windows
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 Mc Lean
How your county's soil matches Thyme's growing requirements.
Soil pH
Your soil pH (6.0–7.0) is within Thyme's preferred range (6.0–8.0).
Soil Texture
The silt loam soil in McLean County is excellent for Thyme — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (5.1%) — Thyme will thrive.
How to Plant Thyme
Succession Planting Thyme
Sow every 8 weeks. Last sowing by Jul 20 to harvest before frost.
Thyme Water Budget
Monthly Watering Guide for Thyme
Thyme needs approximately 0.3 inches of water per week (1.3" per month). Here's how your county's rainfall compares month by month.
| Month | Thyme Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.3" | 0" | ❄️ Dormant |
| Mar | — | 2.5" | 0" | ❄️ Dormant |
| Apr | 1.3" | 2.9" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 4" | 0" | ✅ Rainfall sufficient |
| Jun | 1.3" | 3.8" | 0" | ✅ Rainfall sufficient |
| Jul | 1.3" | 3.5" | 0" | ✅ Rainfall sufficient |
| Aug | 1.3" | 3.2" | 0" | ✅ Rainfall sufficient |
| Sep | 1.3" | 2.7" | 0" | ✅ Rainfall sufficient |
| Oct | 1.3" | 2.8" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2" | 0" | ❄️ Dormant |
| Dec | — | 1.9" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in McLean County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Thyme Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Thyme Planting Timeline — Mc Lean, IL
Thyme Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | April 25 | Apr 25 – May 9 |
| Harvest | July 4 | Jul 4 – Sep 5 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–8 · Your soil: ideal
🗺️ USDA Zone
Zone 6a
📆 Growing Season
183 days in McLean County
Growing Tips for Thyme in Mc Lean
Direct sow Thyme outdoors after April 18 in McLean 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
Check more plant combinations with our Companion Planting Checker →
Thyme in Other Locations
When should I plant Thyme in Mc Lean, ?
In Mc Lean, , plant Thyme after the last frost (around April 18) and before the first frost (around October 18). Best results when soil holds above 50°F.
What growing zone is Mc Lean, for Thyme?
Mc Lean sits in USDA Zone 6a. Thyme grows reliably in zones 4a through 9b, so it's a good fit here.
Can Thyme grow in Mc Lean's climate?
Yes — Thyme grows well in Mc Lean's temperate climate. Mc Lean averages a 183-day frost-free season, with last frost around April 18 and first frost around October 18.
Your McLean County Garden Planner — Free
A 22-page printable planner built for McLean County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.