Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Onalaska you can figure out when you can plant bidens by using the USDA zone info.

Planting Calendar for Bidens

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

Since bidens require warm weather you need to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant bidens in Onalaska 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 bidens and expect a good harvest is probably August. Any later than that and your bidens may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your bidens indoors.

Last Frost Date

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

Keep in mind that USDA zone info for Onalaska is an average and the actual date of last frost changes from year to year. Half of the time in Onalaska it frosts late in the year after May 15 so make sure that you are ready to cover your bidens if you have a late frost.

USDA Zone Info for Onalaska

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 Onalaska

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