When to Plant Sweet Potatos in Zone 1b

The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of determining when it's possible to plant sweet potatos is to check out the USDA zone info for Zone 1b.


Planting Calendar for Sweet Potatos

Frost tolerance for sweet potatos: Not tolerant of frost.
When to plant: After all chance of frost has passed.

Since sweet potatos are not cold tolerant you really should wait until after the last frost when the weather gets warmer before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant sweet potatos
Possibly ok, but a risky time to plant sweet potatos
Probably not a good time to plant sweet potatos

The earliest that you can plant sweet potatos in Zone 1b is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant sweet potatos and expect a good harvest is probably July. You probably don't want to wait any later than that or else your sweet potatos may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your sweet potatos indoors.

Last Frost Date

The average date of last frost is June 15 in Zone 1b. You can expect an average low temperature of -55°F in the coldest months of winter.

Since the USDA zone info for Zone 1b is an average the actual date of last frost changes from year to year. Half of the time in Zone 1b it frosts late in the year after June 15 so always be ready to cover your sweet potatos if you have one of those late frosts.

USDA Zone Info for Zone 1b

Here is the info for USDA Zone 1b.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-55°F
Highest Expected Low-50°F

This means that on a really cold year, the coldest it will get is -55°F. On most years you should be prepared to experience lows near -50°F.

Plants to Grow in Zone 1b

You may be interested in your other planting guides for Zone 1b.