When to Plant in Knoxville, TN

In Knoxville, the gardening season is framed by the median last spring frost date of April 16 and the first fall frost on October 22, allowing for 193 frost-free days. During this time, gardeners can cultivate a variety of plants, taking advantage of the vibrant growing season that spans spring through fall. The period between these dates is ideal for planting a range of fruits, vegetables, and flowers, ensuring optimal growth and harvest potential.

Knoxville experiences a humid subtropical climate characterized by hot, humid summers and mild winters, making it well-suited for growing a variety of crops. Vegetables such as tomatoes, peppers, and corn thrive in this environment, benefiting from warm summers and ample rainfall. Conversely, crops like blueberries and peaches may struggle due to humidity-related diseases like blight, which can affect fruit yields. Understanding these seasonal dynamics is key to successful gardening in Knoxville.

What to plant now in Knoxville

Spring: Begin planting cool-season crops such as peas and lettuce from mid-March until mid-April, but be cautious around the last frost date of April 16 to protect young plants.
Summer: Start planting heat-loving vegetables like tomatoes and peppers after the last frost date, ensuring they have ample time to mature before the fall frost on October 22.
Fall: As summer crops slow down, consider planting fall vegetables such as kale and radishes, ideally by mid-September, to ensure harvest before the first frost on October 22.
Winter: While outdoor gardening is limited, planning and preparing for spring planting is crucial. Indoor gardening can include herbs and hardy greens, to be planted from late winter onwards.

In Knoxville (189 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.

Month by month in Knoxville

Month	What to do
January	During January, the coldest month in Knoxville, review your garden plans for the upcoming year. Start seeds indoors for early spring vegetables like broccoli and cabbage.
February	In February, continue with indoor seed starting for cool-season crops. Prepare your garden beds and gather necessary supplies to be ready for spring planting soon.
March	March signals the onset of spring, and by mid-March, you can sow cool-season crops like peas and onions outdoors. Watch the weather closely to protect seedlings from frost.
April	April brings transitional weather, and gardeners must be vigilant until the last frost date of April 16. Plant additional cool-weather crops and be ready to cover them if late frosts threaten.
May	May is ideal for planting warm-season crops after the last frost on April 16. This month is perfect for tomatoes, peppers, and beans, ensuring they establish well before summer heat.
June	June starts the summer heat, making it essential to keep an eye on watering. Continue caring for your young plants and begin to harvest early crops like lettuce.
July	July typically features hot weather. Maintain consistent watering for summer crops, and regularly check for pests. This is the time to enjoy the fruits of your labor with early tomatoes.
August	In August, warmer temperatures continue. Start planning for fall crops by sowing seeds for fast-growing varieties like radishes and turnips. Begin to prepare for the transition to autumn gardening.
September	September marks the onset of fall. Start planting cold-tolerant crops like kale and spinach, ensuring they have enough time to mature before the first frost on October 22.
October	As October arrives, complete your fall planting before the first frost date on October 22. Harvest remaining summer crops, and prepare your garden for the winter.
November	In November, gardening largely comes to a halt outdoors. Focus on clean-up tasks; remove debris and consider mulching to protect the soil during winter months.
December	December is the month for planning and dreaming about the next gardening season. Start organizing seed catalogs and make lists of desired plants for the upcoming spring.

Frost dates for Knoxville ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
37918	April 16	October 22	7b
37919	April 13	October 23	7b
37916	April 13	October 23	7b

FAQ

When is the last frost in Knoxville?

The last frost date in Knoxville is typically around April 16, making it crucial for gardeners to plan their planting schedule accordingly.

What vegetables grow best in Knoxville?

Knoxville's climate supports vegetables like tomatoes, peppers, and corn, which thrive in warm weather and have a long growing season.

When should I plant tomatoes in Knoxville?

Tomatoes should be planted after the last frost on April 16, typically around late April to early May for optimal growth.

Can I garden year-round in Knoxville?

Gardening year-round can be challenging due to winter frosts, but with careful planning and the use of greenhouses or indoor gardening, some crops can be grown.

How does Plan My Garden help Knoxville gardeners?

Plan My Garden provides tailored advice and resources, ensuring Knoxville gardeners can maximize their garden's potential based on local frost dates and climate conditions.