One of the first steps you take when you are estimating your gardening schedule is find your 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.

A common way of determining when to plant digitalis is to consult the USDA zone info for Waterloo.

Planting Calendar for Digitalis

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

Since digitalis do well in moderate cold you can plant them a little bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant digitalis in Waterloo is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant digitalis and expect a good harvest is probably September. Any later than that and your digitalis may not have a chance to grow to maturity. You can get started a little bit earlier by starting your digitalis indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Waterloo. You should expect an average low temperature of -20°F in the coldest months of winter.

Since the USDA zone info for Waterloo is not always accurate the actual date of last frost changes from year to year. Since half of the time in Waterloo it frosts late in the year after April 15 be ready to cover your digitalis if you have a surprise late frost.

USDA Zone Info for Waterloo

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Waterloo

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