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

In Portsmouth you can determine when it's the best time to plant pole beans by referring to the USDA zone info.

Planting Calendar for Pole beans

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

Pole beans are not cold tolerant which means that it's important to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant pole beans in Portsmouth is April. However, you really should wait until May 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 really do well. You can get started a little bit earlier by starting your pole beans indoors.

Last Frost Date

On average the last frost has passed is on March 15 in Portsmouth. In the coldest months of winter you should expect an average low temperature of 10°F.

Always keep in mind that USDA zone info for Portsmouth is not always accurate and the actual date of last frost will vary from year to year. Half of the time in Portsmouth you get surprised by a frost after March 15 so just be sure to be ready to protect your pole beans in the event of a surprise late frost.

USDA Zone Info for Portsmouth

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Portsmouth

You may be interested in your other planting guides for Portsmouth.