Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's possible to figure out when to plant calliopsis by referring to the USDA zone info for Spirit Lake.

Planting Calendar for Calliopsis

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

It's not a good idea to plant calliopsis until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant calliopsis in Spirit Lake 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 calliopsis and expect a good harvest is probably August. Any later than that and your calliopsis may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your calliopsis indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Spirit Lake. In the coldest months of winter you can expect an average low temperature of -20°F.

Since the USDA zone info for Spirit Lake is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Spirit Lake last frost occurs after April 15 so always be ready to protect your calliopsis in the event of one of those late frosts.

USDA Zone Info for Spirit Lake

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 Spirit Lake

You may be interested in your other planting guides for Spirit Lake.