Find Your Gardening Zone

What Is the Map? What Is Your Zone?

The US Department of Agriculture produces a map for gardeners based on the average of low temperature readings taken from weather stations throughout the United States. The idea is to give the garden industry a way to communicate the cold hardiness of landscape plants. That is why the tag of a holly or any other landscape plant often says “hardy to zone __.”

Of course, the map also provides vegetable and herb gardeners like you with a rough guide to the extent of cold where you live. Many of our perennial flowers and herbs are hardy as far north as zones 3 or 4. Cool-season vegetables, most of which tolerate or even like a little frost, will grow well in zones 7 and southward in the fall. This is roughly where we distribute transplants to your local garden center at the proper time for planting. See below to find your gardening zone.

Find Your Hardiness Zone by Entering Your Zip Code.

Hardiness Zone Map for the Lower 48
USDA Hardiness Zones and Average Annual Minimum Temperature Range 1976-2005
  Temp (F)  
    Temp (C)    
-60 to -55
-51.1 to -48.3
-55 to -50
-48.3 to -45.6
-50 to -45
-45.6 to -42.8
-45 to -40
-42.8 to -40
-40 to -35
-40 to -37.2
-35 to -30
-37.2 to -34.4
-30 to -25
-34.4 to -31.7
-25 to -20
-31.7 to -28.9
-20 to -15
-28.9 to -26.1
-15 to -10
-26.1 to -23.3
-10 to -5
-23.3 to -20.6
-5 to 0
-20.6 to -17.8
0 to 5
-17.8 to -15
5 to 10
-15 to -12.2
10 to 15
-12.2 to -9.4
15 to 20
-9.4 to -6.7
20 to 25
-6.7 to -3.9
25 to 30
-3.9 to -1.1
30 to 35
-1.1 to 1.7
35 to 40
-1.7 to 4.4
40 to 45
4.4 to 7.2
45 to 50
7.2 to 10
50 to 55
10 to 12.8
55 to 60
12.8 to 15.6
60 to 65
15.6 to 18.3
65 to 70
18.3 to 21.1



can I grow sweet onions in central fl in the summer heat gets about 6-7 hours of sunlight.just harvested my spring onions.

Danielle Carroll

Hi Max,
You are going to have to wait until the cool weather comes again 🙁 Onions are a cool weather veggie. – danielle, Bonnie Plants


Hello there! I could have sworn I’ve visited this web site before but after going through some of the articles I realized it’s new to me.

Regardless, I’m certainly delighted I discovered it and I’ll be book-marking it and checking back frequently!


I live in the Imperial Valley 40 miles West of Yuma, Arizona and 2 hours East of San Diego What is my zone? and what can I grow her duging the summer?

Danielle Carroll

Hello Samantha,
If you go here, you can type in your zip code and get your planting zone. There are a couple of zones around the area – you will probably be a 10a or 10b. You can grow many warm season veggies like tomatoes, peppers, and eggplant (and many more). This is the planting guide with dates from the Univeristy of Arizona extension (since you are so close). You will find detailed varieties and planting dates for the area.
-Danielle, Bonnie Plants


Last year in May I started Armenian Tomato seedlings in my greenhouse. When they got up to around 8-10″ it turned really hot here in SE Oklahoma, 105+ every day for almost 3 months! They didn’t grow much more, but I left them overwinter keeping them watered in the heated greenhouse. In December I pulled all of the other varieties that were dried up and noticed one tomato starting on a single plant. I left it and 3 other plants until late February, then transplanted all of them to the back that gets partial summer shade. They’re all growing well now, and that single tomato is about ready to harvest, and the Cauliflower I left is also growing well now. Just added an 8′ x 8′ open extension on the back that I can cover with a shade screen when it gets too hot, for corn, beans, cucumber, and potatoes. The sides are formed with rigid 6″ grid 1/4″ concrete reinforcing galvanized steel bar to act as a ‘trellis’ for the vining crops, and the peaked top is made from 1″ pvc schedule 80 pipe with the front being the same pipe with a removable door. I’ll be wrapping the entire thing with small mesh chicken wire to keep the squirrels out.
Last summer was a real learning experience, and I expect this one to be pretty much the same, weather wise! I’ve installed a solar powered fan in the greenhouse, but I think it needs to be a larger one, just doesn’t circulate the air as much as I thought it might.

Danielle Carroll

Hi Larry,
Sounds like you have been very busy, good luck with the squirrels.
-Danielle, Bonnie Plants

Barbara Guerrero

I live in Sacramento California which I believe is zone 9. Im not sure when I start planting my cucumbers, (both green and lemon), tomatoes various varities, and lastly cantaloupes and watermelon. Which did terrible last year, I planted too close of all which I planted. How or where do I plant the cantaloupe and watermelon in a raised bed instead of the ground….. help

Mary Beth

Hi Barbara,
You’re on the right track with reading our article about gardening zones, but need to go a slightly different route. Most vegetables and herbs that are annuals are planted as determined by frost dates, not zones. Perennials like strawberries or rhubarb (and all other perennials in your flower garden) are dictated by gardening zones based on weather averages. So, for most everything that we sell in veggies and herbs, you’ll want to follow your calendar for last frost date in spring and first frost date in fall. Tomatoes, cucumbers and all of those that you list are warm-season crops and should be planted after the danger of the last frost date has passed. Use this map to see what week in spring is safe for you to get those hands dirty! You might also enjoy our newest page, a guide for New Gardeners, for a collection of advice on getting started. ~Mary Beth, Bonnie Plants


I am in the Casa Grande AZ area (45 miles S of Phoenix). All my plants including tomato and peppers were burned this summer by the heat and direct sunshine. I am growing plants in containers. I watered them every morning at 4 or 5AM. My question to you is: Should the plants be covered with a net screen in the heat of the day?

Kelly Smith Trimble

Hi Stu,

Yes, this is a problem for a lot of gardeners in your area. While vegetables like full sun (usually defined as 6-8 hours), the intense, hot Southwest sun can be too much for them. One common solution is to install a shade cloth or sun screen fabric (basically the same thing, but found under both names). You should be able to find some at an online garden supply store or in your local garden center, then install it to suit your space. You could also move the containers, if they are fairly lightweight, to a shady spot mid-day, but this would be labor intensive and you’re likely not home every day anyway. I hope this helps!

Kelly, Bonnie Plants

Sarah English

We live in the Phoenix metro area. We currently are having highs above 110. We planted 2 Phoenix variety tomato plants in our garden this spring. These plants are amazing, easily the best tomato plants we have ever had. Even in this heat they are still producing softball size tomatoes. The fruit is high quality with a great flavor. Thank you!

Kelly Smith Trimble

Hey Sarah,

That is awesome news! We just recently added the Phoenix tomato variety to our list of heat-tolerant tomato plants. We wanted to give our customers in hot areas (like Arizona!) more growing options. It’s great to hear this plant is working well for you.

If you’d like, you can go to the Phoenix variety description page and be the first customer to review and rate this tomato. We appreciate your opinion.

Happy growing!
Kelly, Bonnie Plants

maria menendez

Hi I just started a container garden which is my first attempt at gardening. I have a bell pepper plant which had som e flowers and has only produced so far 1 pepper . Please help what can I do. By the way I planted the pepper in a container.

I also have an eggplant plant that is doing better but only produced 3 fruits. How often should I fertilize my plants. I have noticed some of the leave look eaten but I cannot find the culprit insect. Help…..
Please write back,
Maria Menendez(first timer)

Kelly Smith

Hi Maria,

When did you plant these veggies in containers? It sounds like you’re learning one of the hardest lessons of a first-time gardener…how to be patient when all you want is those ripe peppers and eggplants! Bell peppers such as our Bonnie Green Bell take roughly 75 days from planting to produce ripe fruit. Eggplant such as the Ichiban variety matures a little quicker, in 50 to 60 days, but that still may feel like a long time.

Be sure to read up on growing in containers in our Container Gardening section. You can also read up on watering techniques and amounts in our Watering section, and you might also enjoy learning some basics in our Gardening Basics section. If you see problems with your plants, you can use our free Ask an Expert service to get expert advice from a nationwide network of Cooperative Extension experts.

I hope this helps! Happy growing!
Kelly, Bonnie Plants

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