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.

You will be able to figure out when to plant stevia by looking at the USDA zone info for Waterloo.

Planting Calendar for Stevia

Frost tolerance for stevia:	Not tolerant of frost.
When to plant:	After the last frost.

Since stevia require warm weather it's important to wait until after the last frost has passed before you can plant them.

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

The last month that you can plant stevia and expect a good harvest is probably August. Any later than that and your stevia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your stevia indoors.

Last Frost Date

The average date of last frost is April 15 in Waterloo. In the coldest months of winter you can expect an average low temperature of -5°F.

Keep in mind that USDA zone info for Waterloo is an average and 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 protect your stevia if you have a late frost.

USDA Zone Info for Waterloo

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Waterloo

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