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.

A way of estimating when it's possible to plant bidens is to consult the USDA zone info for Blackfoot.

Planting Calendar for Bidens

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

Since bidens are not cold tolerant it's necessary to wait until after the last frost before you can plant them.

The earliest that you can plant bidens in Blackfoot 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 bidens and expect a good harvest is probably August. If you wait any later than that and your bidens may not have a chance to really do well. You can get started a few weeks earlier by starting your bidens indoors.

Last Frost Date

On average the last frost is on April 15 in Blackfoot. In the coldest months of winter you can expect an average low temperature of -15°F.

It's important to remember that USDA zone info for Blackfoot is an average and the actual date of last frost is different every year. Half of the time in Blackfoot you get a frost after April 15 so make sure that you are ready to protect your bidens if you have a late frost.

USDA Zone Info for Blackfoot

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

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

Plants to Grow in Blackfoot

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