One of the first steps you take when you are figuring out 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.

In Superior you can figure out when it's the best time to plant digitalis by referring to the USDA zone info.

Planting Calendar for Digitalis

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

Digitalis are one of those plants that can tolerate a little bit of cold weather which means that you can plant them earlier than more sensitive plants.

The earliest that you can plant digitalis in Superior 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 digitalis and expect a good harvest is probably August. You probably don't want to wait any later than that or else your digitalis may not have a chance to grow to maturity. If you are starting your digitalis indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on May 15 in Superior. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Superior may not be accurate from year to year the actual date of last frost will vary from year to year. Half of the time in Superior there is a last frost after May 15 so make sure that you are ready to cover your digitalis in the event of a late frost.

USDA Zone Info for Superior

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 Superior

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