2026 Planting Guide
Spring cropWhen to Plant Tomatoes in Wisconsin
Complete guide to growing tomatoes in Wisconsin with optimal planting dates, recommended varieties, soil requirements, pest management, and harvest timing. Data sourced from USDA and state extension services.
Monthly Planting Calendar
Visual overview of the tomatoes growing season in Wisconsin. Red diamond markers indicate frost date boundaries.
Quick Facts
Min. Soil Temp
60°F (16°C) minimum
Growing Period
65-85 days
From planting to harvest
Last Spring Frost
May 5
Wait until after this date
First Fall Frost
September 28
Harvest before this date
Monthly Task Timeline
Month-by-month guide for managing tomatoes in Wisconsin.
January - April
Off-seasonCover crop planting, soil testing, equipment maintenance, and planning for next season.
May - June
PlantPrepare soil, apply starter fertilizer, and sow seeds at recommended depth and spacing.
July
Grow & MonitorIrrigate as needed, scout for pests, apply side-dress fertilizer, and manage weeds.
August - October
HarvestCheck maturity indicators, schedule equipment, harvest at optimal moisture content.
November - December
Off-seasonCover crop planting, soil testing, equipment maintenance, and planning for next season.
Best Tomatoes Varieties for Wisconsin
These varieties have proven performance in Wisconsin's climate and soil conditions. Always source certified seed from reputable dealers.
| # | Variety | Best For |
|---|---|---|
| 1 | Celebrity | Wisconsin climate |
| 2 | Early Girl | Wisconsin climate |
| 3 | Defiant PhR | Wisconsin climate |
| 4 | Juliet | Wisconsin climate |
Growing Tips for Wisconsin
Region-specific advice from agricultural extension services and experienced Wisconsin farmers.
Short growing season — use early-maturing types
High tunnels extend season by 4-6 weeks
University of Wisconsin variety trials available
Pest & Disease Watch
Monitor for these threats throughout the growing season. Integrated Pest Management (IPM) is recommended.
Tomato hornworm
Scout regularly and use integrated pest management
Whiteflies
Scout regularly and use integrated pest management
Aphids
Scout regularly and use integrated pest management
Late blight
Scout regularly and use integrated pest management
Fusarium wilt
Scout regularly and use integrated pest management
Companion Planting
These plants grow well alongside tomatoes, improving pest control, pollination, and nutrient availability.
Frost Dates
Last Spring Frost
May 5
Wait until after this date before planting frost-sensitive crops outdoors.
First Fall Frost
September 28
Plan to complete harvest of warm-season crops before this date arrives.
Frequently Asked Questions
When is the best time to plant tomatoes in Wisconsin?
The optimal planting window for tomatoes in Wisconsin is May 20 to June 5. Soil temperature should reach at least 60°F (16°C) minimum before planting. The total growing period is 65-85 days.
What varieties of tomatoes grow best in Wisconsin?
The best varieties for Wisconsin include Celebrity, Early Girl, Defiant PhR, Juliet. These varieties are adapted to local climate and soil conditions and have proven performance records.
When can I harvest tomatoes in Wisconsin?
The harvest window for tomatoes in Wisconsin is typically August 1 to October 1. The crop takes 65-85 days from planting to reach maturity.
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Data Sources
Data sourced from USDA NASS Crop Planting Dates, Wisconsin Cooperative Extension Service, and NOAA frost date records. Last updated: March 2026.
Planting dates are averages and may vary by county, elevation, and local microclimate. Always consult your local extension office for the most precise recommendations.