Before planting it is a good idea to find your USDA Zone info to figure out your garden 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 Portland it's a good idea to estimate when it's a good idea 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 has passed.

It's not a good 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 Portland is March. However, you really should wait until April 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 September. If you wait any later than that and your pole beans may not have a chance to really do well. You can get started a couple of weeks earlier by starting your pole beans indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Portland. In the coldest months of winter you can expect an average low temperature of 25°F.

It's important to remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Portland and it changes from year to year. Since half of the time in Portland it frosts late in the year after February 15 be ready to protect your pole beans in the event of a surprise late frost.

USDA Zone Info for Portland

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

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

Plants to Grow in Portland

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