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2023 USDA Cold Hardiness Zone Map
2023 USDA Cold Hardiness Zone Map

Cold Hardiness Zone Shipping & Planting Schedule

ATTENTION MONTANA RESIDENTS: DUE TO STATE LAWS, WE CANNOT SHIP PLANTS INTO YOUR STATE BETWEEN THE DATES OF JUNE 1st & SEPTEMBER 30th.

Sooner Plant Farm recommends planting within the date ranges listed below to avoid late spring and early fall freezes.

IMPORTANT:
If you select "Ship at the Best Time for My Zone" during checkout, we will follow the chart below based on your hardiness zone.

If you select the "Ship Now" option and the date is outside the recommended date ranges listed below, our guarantee will automatically be voided, and we will note your order and proceed with shipping per your request. Sooner Plant Farm is not responsible for any plant loss sustained when shipping outside of our recommended shipping date ranges.

 

OUR RECOMMENDED SHIPPING & PLANTING SCHEDULE       

ZONE

Temperature Range

BEGIN SHIPPING DATE

LAST SHIPPING DATE

2a 

-50 to -55 degrees

June 1st

August 15th

2b

-40 to -45 degrees

June 1st

August 15th

3a

-40 to -35 degrees

June 1st

September 15th

3b

-35 to -30 degrees

June 1st

September 15th

4a

-30 to -25 degrees

June 1st

September 15th

4b

-25 to -20 degrees

June 1st

September 15th

5a

-20 to -15 degrees

May 15th

October 15th

5b

-15 to -10 degrees

May 15th

October 15th

6a

-10 to -5 degrees

May 1st

October 31st

6b

-5 to 0 degrees

May 1st

October 31st

7a

0 to 5 degrees

April 15th

October 31st

7b

5 to 10 degrees

April 15th

October 31st

8a

10 to 15 degrees

March 15th

November 15th

8b

15 to 20 degrees

March 15th

November 15th

9a

20 to 25 degrees

February 15th

December 15th

9b

25 to 30 degrees

February 1st

December 15th

10a

30 to 35 degrees

February 1st

December 15th

10b 

35 to 40 degrees

February 1st

December 15th

11a

40 to 45 degrees

February 1st December 15th

11b

45 to 50 degrees

February 1st December 15th

12a

50 to 55 degrees

February 1st December 15th

Note: Most plants do very well with fall planting, in fact it is a preferred planting time for many reasons. However, there are some species of plants that do not tolerate fall planting. Generally warm season growers like grasses and some perennials like Agastache and others prefer to be planted in spring when day light hours are increasing, and temperatures are getting warmer. If you have questions or concerns regarding when best to plant, please contact us.

Important: Cold hardiness ratings can be variable and are only a reference to gauge how likely a plant is to survive the normal average yearly climatic cold temperatures in your location or hardiness zone. If you live in a zone 6 location, and you receive temperatures colder than zone 6, there it is likely your zone 6 plants may not survive.

If you plan to grow your plants in a container or raised flower bed, those plants can be subjected to cold temperatures 2 zones colder than inground planting. For that reason we highly recommend referencing other reliable horticultural sources like Dave's Garden when making plant selections you may not be familiar with.