One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By referring to the USDA zone info for River Falls you will be able to figure out when it's possible to plant iberis.

Planting Calendar for Iberis

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

Iberis do well in moderate cold which means that you can plant them earlier than plants that are more sensitive to the cold.

The earliest that you can plant iberis in River Falls 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 iberis and expect a good harvest is probably August. Any later than that and your iberis may not have a chance to really do well. You can get started a little bit earlier by starting your iberis indoors.

Last Frost Date

On average the last frost is on May 15 in River Falls. In the coldest months of winter you should expect an average low temperature of -25°F.

It's important to remember that USDA zone info for River Falls is just an average and the actual date of last frost will vary from year to year. Half of the time in River Falls you get a frost after May 15 so always be ready to protect your iberis in the event of one of those late frosts.

USDA Zone Info for River Falls

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 River Falls

You may be interested in your other planting guides for River Falls.