The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to figure out when it's the best time to plant geranium by referring to the USDA zone info for Mukwonago.

Planting Calendar for Geranium

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

It's not a good idea to plant geranium until after the last frost has passed because they are not cold tolerant.

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

Last Frost Date

The average date of last frost is April 15 in Mukwonago. It might get as low as -20°F during the coldest months of winter.

Since the USDA zone info for Mukwonago is an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Mukwonago last frost occurs after April 15 be ready to protect your geranium if you have a late frost.

USDA Zone Info for Mukwonago

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Mukwonago

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