One of the first steps you take when you are making a decision about 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.

The first opportunity to plant coral bells in Owatonna can be estimated by reviewing the USDA zone info.

Planting Calendar for Coral Bells

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

You can plant coral bells a little earlier in the year because they are moderately cold tolerant.

The earliest that you can plant coral bells in Owatonna 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 coral bells and expect a good harvest is probably August. Any later than that and your coral bells may not have a chance to grow to maturity. If you are starting your coral bells indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Owatonna. In the coldest months of winter you can expect an average low temperature of -25°F.

Since the USDA zone info for Owatonna may not be accurate from year to year the actual date of last frost changes from year to year. Since half of the time in Owatonna you get a frost after May 15 be ready to cover your coral bells if you have a surprise late frost.

USDA Zone Info for Owatonna

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 Owatonna

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