When to Plant in Joliet, IL

In Joliet, gardeners should be mindful of the frost dates, with the median last spring frost occurring on April 29 and the first fall frost on October 9. This results in approximately 163 frost-free days each year, offering a solid growing season for a variety of crops. These frost dates are crucial for planning when to sow seeds directly in the garden or when to start seedlings indoors for transplanting later.

Joliet features a humid continental climate characterized by four distinct seasons, facilitating the growth of many crops. The warm summers provide an excellent environment for tomatoes, peppers, and squash, which thrive in the warmer temperatures and longer days. However, the colder winters can create challenges for crops like basil and certain leafy greens, as these plants prefer milder climates and can struggle with frost. The seasonal variability necessitates careful planning and selection of crops that are well-suited to Joliet's climatic conditions.

What to plant now in Joliet

Spring: Start tomatoes and peppers indoors by mid-March for transplanting after the last frost on April 29. Direct sow cool-season crops like peas and lettuce in early April to enjoy early harvests.
Summer: By early June, after the last frost has passed, it’s time to plant warm-weather crops such as cucumbers and zucchini. Ensure proper watering and mulch to maintain soil moisture during the hot summer months.
Fall: Begin planning your fall garden in late August. By mid-September, start planting spinach and other quick-growing greens to harvest before the first frost on October 9. Protect these crops with row covers.
Winter: While outdoor gardening is limited, this is a perfect time to plan and design your spring garden layout. Consider starting indoor herbs such as basil and cilantro if you have a sunny window.

In Joliet (163 frost-free days, a moderate season), 31 of 56 planner crops fit outright, 24 get two plantings, 1 crop is perennial.

Month by month in Joliet

Month	What to do
January	January is the perfect time to plan your garden for the upcoming spring. Review last year's successes and challenges while considering crops that thrive in a humid continental climate.
February	As February arrives with cold temperatures, it's a good month to start indoor seedlings for early crops. Consider starting tomato and pepper seeds indoors for a head start.
March	In March, begin hardening off seedlings that were started indoors. Pay attention to the weather, as the last frost can occur as late as April 29. Prepare soil for direct sowing.
April	April is pivotal as the last frost date falls on April 29. It’s advisable to wait until after this date to transplant seedlings outdoors, as well as to direct sow crops like carrots and peas.
May	May brings warmer soil temperatures; it's time to plant a variety of warm-season crops. Consider planting beans, corn, and cucumbers, ensuring you give them plenty of sunlight and water.
June	June is full of growth as temperatures rise. Maintain consistent watering and watch for pests as your summer crops begin to flourish. Support tall plants like tomatoes and pole beans.
July	In July, continue to harvest summer crops. It's also a great time to plant a second round of quick-growing crops like bush beans and radishes for late summer or fall harvest.
August	August can bring heat stress; ensure your garden is adequately watered. Start planning for late-season crops and consider planting fall greens that can withstand cooler temperatures.
September	As September rolls in, begin planting cool-season crops like kale and spinach for a fall harvest. Remember the first frost is typically around October 9, so manage your timing carefully.
October	October marks the transition to cooler weather. Harvest remaining fall crops and prepare your garden for winter. Remember to finish planting before the first frost on October 9.
November	November signals the end of the gardening season in Joliet, with colder temperatures settling in. Clean and prepare your garden beds for winter, considering cover crops to enhance soil health.
December	December is a time for rest in the garden. Focus on indoor gardening with herbs or planning next year’s garden layout and purchasing seeds during this slow gardening season.

Frost dates for Joliet ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
60435	April 29	October 9	6a

FAQ

When is the last frost in Joliet?

The last frost in Joliet typically occurs on April 29, making it essential for gardeners to plan their spring planting accordingly.

What vegetables grow best in Joliet?

Vegetables like tomatoes, peppers, and squash thrive in Joliet's humid continental climate, enjoying the warm summers and ample sunlight.

When should I plant tomatoes in Joliet?

Tomatoes should be started indoors by mid-March and transplanted outdoors after the last frost date of April 29 to ensure a successful growing season.

Can I garden year-round in Joliet?

Gardening year-round is challenging in Joliet due to its cold winters. However, certain indoor herbs can be grown, and planning for the next season is possible.

How does Plan My Garden help Joliet gardeners?

Plan My Garden provides localized gardening resources, tailored planting calendars, and advice specifically designed for the unique climatic conditions of Joliet.