One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A common way of determining when it's the best time to plant corn is to refer to the USDA zone info for Wausau.

Planting Calendar for Corn

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

Since corn are not cold tolerant it is important to wait until after the last frost has passed before you can plant them.

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

Last Frost Date

The average date of last frost is May 15 in Wausau. In the coldest months of winter you can expect an average low temperature of -25°F.

Since the USDA zone info for Wausau may not be accurate from year to year the actual date of last frost is different every year. Since half of the time in Wausau last frost occurs after May 15 be ready to cover your corn in the event of one of those late frosts.

USDA Zone Info for Wausau

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 Wausau

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