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.

One way of getting a good idea when it's a good idea to plant nierembergia is to consult the USDA zone info for Mequon.

Planting Calendar for Nierembergia

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

You can not plant nierembergia until after the last frost because they require warm weather.

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

Last Frost Date

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

Keep in mind that USDA zone info for Mequon is an average and the actual date of last frost is different every year. Half of the time in Mequon it frosts late in the year after April 15 so make sure that you are ready to cover your nierembergia in the event of a surprise late frost.

USDA Zone Info for Mequon

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 Mequon

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