One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first chance to plant coral bells in Onalaska can be determined by using the USDA zone info.

Planting Calendar for Coral Bells

Frost tolerance for coral bells:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Coral Bells can survive in moderate cold which tells us that you can plant them just a bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant coral bells in Onalaska 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 coral bells and expect a good harvest is probably August. You probably don't want to wait any later than that or else your coral bells may not have a chance to fully mature. Starting your coral bells indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Since the USDA zone info for Onalaska is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Onalaska you get a frost after May 15 so be sure to be ready to protect your coral bells in the event of a surprise 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.