One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant green beans in Zone 4b can be figured out by checking out the USDA zone info.

Planting Calendar for Green beans

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

Since green beans require warm weather you must wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant green beans in Zone 4b 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 green beans and expect a good harvest is probably August. You probably don't want to wait any later than that or else your green beans may not have a chance to fully mature. If you are starting your green beans indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost is on May 15 in Zone 4b. You should expect an average low temperature of -25°F in the coldest months of winter.

Remember that the actual date of last frost is an average because it is based on the USDA zone info for Zone 4b and it can change quite a bit from year to year. Half of the time in Zone 4b it frosts late in the year after May 15 so just be sure to be ready to protect your green beans in the event of a late frost.

USDA Zone Info for Zone 4b

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°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 -20°F.

Plants to Grow in Zone 4b

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