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

By using the USDA zone info for Zone 4a you should be able to estimate when to plant pole beans.

Planting Calendar for Pole beans

Frost tolerance for pole beans:	Not tolerant of frost.
When to plant:	After the last frost.

It's probably a bad idea to plant pole beans until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant pole beans in Zone 4a is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant pole beans and expect a good harvest is probably August. Any later than that and your pole beans may not have a chance to grow to maturity. Starting your pole beans indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on May 15 in Zone 4a. You should expect an average low temperature of -30°F in the coldest months of winter.

Remember that USDA zone info for Zone 4a is an average and the actual date of last frost will vary from year to year. Since half of the time in Zone 4a you get a frost after May 15 be ready to protect your pole beans in the event of a surprise late frost.

USDA Zone Info for Zone 4a

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Zone 4a

You may be interested in your other planting guides for Zone 4a.