when to plant peppers in wisconsin

Peppers should be started indoors in Wisconsin around mid to late March and then transplanted outdoors after all risk of frost has passed, typically around May 20th to June 1st. Soil temperatures ideally should be around 75°F during the day for planting outside. Starting seeds indoors earlier in March with heat mats is recommended to get a good head start on the short growing season, especially in cooler parts of Wisconsin. Waiting until late May or early June to transplant outdoors ensures the soil is warm enough for the pepper plants to thrive.