When to plant Tomatillo in St. Joseph County, MI
In Zone 6a (St. Joseph County), direct-sow Tomatillo between May 5 and May 26 for spring, after the April 28 last-frost mark.
When to Plant Tomatillo in St. Joseph County, MI
Your July gardening checklist
A quick July briefing for St. Joseph County, Michigan gardeners — what's urgent, what's next, and what can wait.
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Pick tomatillo
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
August will be here before you know it — start on
- First harvests: tomatillo
Tomatillos are a Mexican staple that produces tart, green fruits enclosed in papery husks. They are essential for salsa verde and green sauces.
St. Joseph County, Michigan is in USDA Zone 6a. The average last spring frost is April 28 and the first fall frost is October 16, giving you a growing season of approximately 171 days.
At an elevation of 564 feet, St. Joseph County receives approximately 39.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 84°F, so choose short-season varieties of Tomatillo to ensure they mature before fall.
St. Joseph County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-6.7
Drainage
Well Drained
Tomatillo 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 St. Joseph County
How your county's soil matches Tomatillo's growing requirements.
Soil pH
Your soil pH (5.8–6.7) overlaps with Tomatillo's range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in St. Joseph County is excellent for Tomatillo — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (5.2%) — Tomatillo will thrive.
How to Plant Tomatillo
Succession Planting Tomatillo
Sow every 6.9 weeks. Last sowing by Jul 23 to harvest before frost.
Tomatillo Water Budget
Monthly Watering Guide for Tomatillo
Tomatillo needs approximately 1.1 inches of water per week (4.8" per month). Here's how your county's rainfall compares month by month.
| Month | Tomatillo Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | — | 1.6" | 0" | ❄️ Dormant |
| Mar | — | 2.9" | 0" | ❄️ Dormant |
| Apr | 4.8" | 3.7" | 1.1" | 💧 Light watering |
| May | 4.8" | 5" | 0" | ✅ Rainfall sufficient |
| Jun | 4.8" | 4.5" | 0.3" | 💧 Light watering |
| Jul | 4.8" | 4.4" | 0.4" | 💧 Light watering |
| Aug | 4.8" | 4.1" | 0.7" | 💧 Light watering |
| Sep | 4.8" | 3.5" | 1.3" | 💧 Light watering |
| Oct | 4.8" | 3" | 1.8" | 💧 Light watering |
| Nov | — | 2.9" | 0" | ❄️ Dormant |
| Dec | — | 2.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in St. Joseph County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Tomatillo 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.
Tomatillo Planting Timeline — St. Joseph County, MI
Tomatillo Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 3 | Mar 3 – Mar 17 |
| Transplant Outdoors | May 12 | May 12 – May 26 |
| Direct Sow | May 5 | May 5 – May 26 |
| Harvest | July 14 | Jul 14 – Sep 22 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | — |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.1"/week · Only during dry spells
📅 Days to Maturity
60–85 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 6a
📆 Growing Season
171 days in St. Joseph County
Growing Tips for Tomatillo in St. Joseph County
Direct sow Tomatillo outdoors after April 28 in St. Joseph County when soil has warmed and frost danger has passed.
Common pests for Tomatillo in this region include tomato hornworm and aphids. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6-8 weeks before last frost. Plant at least two plants for cross-pollination. Harvest when fruits fill the husk and it begins to split.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Tomatillo in Other Locations
Frequently Asked Questions
When should I plant Tomatillo in St. Joseph County, MI?
St. Joseph County is in Zone 6a with an average last frost of April 28. Plan your Tomatillo planting based on this frost date — see the calendar above for exact timing.
What planting zone is St. Joseph County, MI?
St. Joseph County, Michigan is in USDA Hardiness Zone 6a. The average last spring frost is April 28 and first fall frost is October 16.
When should I plant Tomatillo in St. Joseph County, MI?
In St. Joseph County, MI, plant Tomatillo after the last frost (around April 28) and before the first frost (around October 16). Best results when soil holds above 50°F.
What growing zone is St. Joseph County, MI for Tomatillo?
St. Joseph County sits in USDA Zone 6a. Tomatillo grows reliably in zones 4a through 11b, so it's a good fit here.
Can Tomatillo grow in St. Joseph County's climate?
Yes — Tomatillo grows well in St. Joseph County's temperate climate. St. Joseph County averages a 171-day frost-free season, with last frost around April 28 and first frost around October 16.
Your St. Joseph County Garden Planner — Free
A 22-page printable planner built for St. Joseph 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.