Written By Lara Wadsworth

June is a prime month for gardeners across the U.S. Whether you’re just getting in the game or are already harvesting early crops, this June planting guide by USDA zone has everything you need to know about what to plant in June! With the majority of the growing season ahead of you, and the risk of frost behind us, it is time to get your hands dirty.. June brings warm summer days, perfect evenings, and a whole lot of plant growth! Let’s get growing.

Understanding First and Last Frost Dates

If you have been following along with our other planting guides, you will notice a big shift in this one. We are now counting down to the first frost of fall, rather than the last frost of spring. The time between these two dates is considered the frost-free growing season. This time period is essential to understand to know what to plant and when. You don’t want to plant a pumpkin that takes 120 days to mature if you only have 90 days in your frost-free season left.

To identify your first fall frost date, I like the Farmer’s Almanac’s page, where you just need to put in your zip code. You can also contact your local extension office and talk to someone there if you’re unsure or want advice more tailored to your area. As always, these dates are just averages. Remember that other factors like elevation, weather patterns, etc. can create microclimates that may cause your exact dates to vary greatly from the average for each zone. So, keep a keen eye on the weather forecast for your area and take action if needed!

Remember, frost dates aren’t the only metrics important to plant selection and planting times. By June, the southern zones of 8, 9, and 10 need to start thinking about the intense heat of summer that can stunt plant growth. The hot summer sun can be too much for some varieties. When growing in these regions, consider using tools like shade cloth to reduce the stress your growing plants experience.

What are USDA Hardiness Growing Zones?

The United States Department of Agriculture (USDA) zone hardiness map assigns a zone number to each region of the United States based on the average winter low temperatures experienced annually. Your zone number helps you determine what perennial plants will thrive in your area. However, the information you gain from identifying your growing zone should also be paired with understanding your first and last frost dates, as this will determine how long your growing season is. Two locations that fall within the same zone assignment may have a shorter or longer growing season from the other. Visit the USDA’s website and enter your zip code to discover what zone you are working with!

What to Plant in June

June marks the start of the summer season for many. With temperatures warming up, you may want to consider just how hot your summers get when planting this month. While cool mountainous regions may still be battling dropping night temperatures, southern areas may need to start thinking about growth-stunting heat and humidity. Consider utilizing season extending tools like shade cloth, or containers that can be moved from one area to another to provide the best growing conditions for your developing garden. Generally, June is reserved for transplanting or direct sowing warm season crops. Check out my recommendations below!

Zone 3

In Zone 3, June is finally the month when the last spring frost date should pass. However, I did hear a story when I was growing up about snow on the 4th of July somewhere in Wyoming, so please, keep checking the weather! This is the month when those in zone 3 can transplant any starts they had growing inside. You can also start direct sowing more things as well. Stick to cool-season crops being planted outdoors during the first half of the month and wait to transplant your tender plants until the second half of the month. I recommend favoring cold-hardy varieties for those in zone 3.

• First Frost Date Window: Early to Mid-September
• Approximate Weeks Until First Frost: 13-17
• Seeds to Start Indoors: While it is not necessary to start seeds indoors, you may opt to start some warm season crops like cucurbits, select herbs, flowers, brassicas (including crucifers), and leafy greens, depending on your preferences. While many crops can be started indoors or directly sown, starting seeds indoors gives you more control over their early growing conditions and can help you avoid damage from late frosts. Note that if you haven't yet started your nightshade seeds like peppers and tomatoes, you still can, but you should expect to see fruiting later than those who may have planted nursery starts. Be sure to keep the length of your growing season in mind (number of days from last spring frost to first fall frost).
• Seeds to Sow Outdoors: Any cool-season crops that can handle light frosts can be directly sown (or transplanted if you started them ahead of time), such as peas, spring onions, root vegetables like rutabaga and parsnip, and cool-season herbs like parsley or cilantro. You will want to hold off on direct sowing warm season crops like beans, squash, and melons until about a week after your last frost date.

Zone 4

A breath of fresh air is what June feels like for those in Zone 4. The frost date has recently passed and June is likely the first full month with no frost. What a relief! But again, keep checking the weather! Frost dates are averages and cold snaps can happen to any area. So, if you transplant or plant your tender annuals outside this month, favor the end of the month and be ready to protect them from cold nights if need be.

• First Frost Date Window: Mid-September to Early October
• Approximate Weeks Until First Frost: 15-18
• Seeds to Start Indoors: Starting seeds indoors in zone 4 is not typical in June. Unless you want a more controlled environment for seed germination, you don’t need to worry about it. However, microgreens are always an option for indoor growing! Plus, they make perfect additions to summer salads and sandwiches.
• Seeds to Sow Outdoors: Legumes such as peas and beans; Cover crops like vetch; Cool-season crops that can handle a light frost and will mature before the heat of summer sets in, such as spinach, spring radishes, and kale. In late June, sow any other seeds that need to be directly sown in the garden, such as carrots and corn, or those you are choosing to directly sow instead of starting ahead of time, like cucurbits and lettuce.

Zone 5

The long dark of winter is finally in the past. While the last average frost is long passed, I again caution to keep an eye on the weather. You may not experience a hard freeze or even a frost, but night time temperatures under 50F can be detrimental to tender annuals like cucumbers, melons, and some herbs. Cautiously plant out your garden with realistic optimism. Be sure to prioritize getting any of your last cool season succession crops planted so they have time to mature before it gets too hot.

• First Frost Date Window: Mid to Late October
• Approximate Weeks Until First Frost: 21-23
• Seeds to Start Indoors: It is unnecessary to start seeds indoors in June. However, you may grow herbs, microgreens, or sprouts indoors for quick and nutrient-dense harvesting.
• Seeds to Sow Outdoors: Legumes such as field peas, clover, and beans (pole, snap, and lima); cucurbits like cucumber, squash, and melon; sweet corn; tender herbs such as basil and cilantro; and any plants that are at risk of bolting in high heat (going to seed too quickly) should be planted now if they haven’t already. This includes leafy greens, herbs, root vegetables, and brassicas.Transplant tomatoes, eggplant, and peppers.

Zone 6

As a zone 6 native myself, June is easily one of my favorite summer months. The daytime temperatures are warm enough to enjoy outside, but it isn’t too hot yet, and nighttime temperatures are nice and refreshing. It’s perfect! Plants love it too. By June, most zone 6 gardens should be in and planted. The last frost date is usually early to mid-May, so by early June, you should be focusing on maintenance and harvesting spring vegetables. You may also sow your last round of succession planting crops before the weather gets too warm next month.

• First Frost Date Window: Late October
• Approximate Weeks Until First Frost: 24-26
• Seeds to Start Indoors: In June, it is not necessary to plant seeds indoors in this zone. Consider supplementing your outdoor harvest with fresh microgreens or sprouts grown in your kitchen! Sprouts can be harvested in a matter of days with microgreens ready in about 1-3 weeks.
• Seeds to Sow Outdoors: You likely have your garden already planted by now, but you can also plant things like beans, early melons, peas, sweet potatoes, and okra that are sensitive to cool temperatures.

Zone 7

Zone 7 gardeners are hitting their stride in June. The weather is warm, the days are long, and your garden is probably buzzing with activity. If you’ve kept up with spring planting, most of your summer crops should already be in the ground. But don’t worry if you’re just getting started, there’s still plenty of time to enjoy a bountiful harvest.

• First Frost Date Window: October to November
• Approximate Weeks Until First Frost: 18-24
• Seeds to Start Indoors: It’s not necessary to start anything indoors this month unless you’re planning for a fall garden. You can get a head start on brassicas like broccoli, cauliflower, and cabbage toward the end of the month if you want to transplant them out later in summer.
• Seeds to Sow or Transplant Outdoors: Beans, cucurbits (squash, melons, cucumbers), corn, and sweet potatoes thrive when direct sown now. You can also sneak in another round of fast-growing greens like lettuce or spinach, just provide them with some afternoon shade to help them avoid bolting.

Zone 8

June in Zone 8 is when the summer sun starts to flex a bit. Your spring crops are likely bolting or coming to the end of their productive phase, but your warm-season crops are loving life. This is a great month to harvest, plant warm-season succession crops, and start planning for the heat of July and August. If you haven't already, favor planting your heat-tolerant crops, and be sure to finish up harvesting any cool-season crops so as to avoid bolting.

• First Fall Frost Date Window: November - December
• Approximate Weeks Until First Fall Frost: 23-30
• Seeds to Start Indoors: It’s a little early to start seeds for fall crops, but growing microgreens and herbs indoors are always fair game. Herbs like basil, arugula, and cilantro all perform well indoors with a good grow light. Try growing some microgreens and sprouts to mix into your fresh summer salads!
• Seeds to Sow or Transplant Outdoors: Beans, okra, cucurbits, corn, sweet potatoes, and heat-tolerant greens like amaranth and Malabar spinach. Herbs like basil, thyme, and oregano will love the warmth. Be sure to mulch well and consider some shade for tender plants during the hottest parts of the day.

Zone 9

Since June in zone 9 features daytime highs between 80-95 F we need to start thinking about summer heat as a limiting factor. June is still prime growing time, but your spring crops are going to start struggling while warm-season and heat-resistant varieties are going to start thriving. By providing mid-day to afternoon shade for cool-season crops you can extend their growing season a bit, but you want to start focusing your efforts on your tender, warm-season crops from here on out. Keep things well watered and mulched. Consider light shade covers to reduce stress from the intense sun.

• First Frost Date Window: November - December
• Approximate Weeks Until First Fall Frost: 26-32
• Seeds to Start Indoors: You can start brassicas like broccoli and cauliflower indoors late in the month for transplanting in the fall. The indoors is also the perfect place to keep growing herbs, sprouts, and microgreens throughout the heat of summer. These crops can be ready in a matter of days to weeks for a refreshing touch to your summer meals.
• Seeds to Sow Outdoors: Sweet potatoes, okra, melons, peanuts, southern peas, eggplant, and heat-tolerant herbs like basil and rosemary

Zone 10

By June in zone 10 we really need to start planning around the scorching heat of mid-summer. Plants struggle to grow in temepratues over 85 F. So, focusing on heat-tolerant varieties is critical. Some garden plants should be completely harvested before this type of high heat sets in or else it will ruin them. Many vegetables take on a bitter flavor with hot summer temperatures. Keep things well watered and mulched to reduce the strain of high temperatures. Consider light shade covers to reduce stress from the intense sun and humidity.

• First Frost Date Window: Does not typically experience frosts.
• Approximate Weeks Until First Frost: N/A
• Seeds to Start Indoors: It is a bit too early to start seeds indoors in preparation for the fall plantings, but you can always keep microgreens and sprouts growing indoors! June is when leafy greens begin struggling to grow outdoors, but you can grow baby greens, microgreens, and sprouts inside to supplement in the meantime!
• Seeds to Sow or Transplant Outdoors: Basil, peppers, eggplant, cucurbits like melons and squash, beans, and corn. Plant out any other warm-season annuals you haven’t yet, including peppers and okra. Check for heat-tolerant varieties of greens like Black Seeded Simpson Lettuce.

June is like the sweet spot of the growing season, warm, full of promise, and brimming with energy. Whether you're just getting started or already deep into your garden rhythm, this is your time to grow bold. Try new things, don’t stress over a few setbacks (we’ve all had a failed tomato plant or two), and most importantly, enjoy the magic of watching tiny seeds turn into something amazing. Gardening isn't about perfection, it’s about progress, patience, and enjoying the dirt.

Lara Wadsworth, True Leaf Market Writer

I am a native of Southwestern Michigan, where I currently reside. I love all things plants! After completing a Bachelor's Degree in Horticulture, I found a dream work-from-home job that allows me to share my passion. Now, I spend my days writing for TLM, playing with my dog, eating delicious food with my husband, and plotting my next landscape or gardening move. I believe everyone should get down and dirty in the soil now and then. Happy Gardening!