Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In River Falls you can estimate when it's the best time to plant schizanthus by using the USDA zone info.

Planting Calendar for Schizanthus

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

Since schizanthus are not cold tolerant you have to wait until after the last frost when the weather gets warmer before you can plant them.

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

Last Frost Date

The average date of last frost is May 15 in River Falls. It might get as low as -25°F during the coldest months of winter.

Just be sure to remember that USDA zone info for River Falls is not always accurate and the actual date of last frost changes 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 schizanthus if you have 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.