The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. 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 estimating when it's a good idea to plant gloriosa lily is to use the USDA zone info for Pierre.

Planting Calendar for Gloriosa Lily

Frost tolerance for gloriosa lily:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since gloriosa lily are not cold tolerant you have to wait until after the last frost has passed before you can plant them.

The earliest that you can plant gloriosa lily in Pierre is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant gloriosa lily and expect a good harvest is probably August. You probably don't want to wait any later than that or else your gloriosa lily may not have a chance to grow to maturity. You can get started a little bit earlier by starting your gloriosa lily indoors.

Last Frost Date

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

Since the USDA zone info for Pierre is just an average the actual date of last frost changes from year to year. Since half of the time in Pierre last frost occurs after May 15 be ready to protect your gloriosa lily in the event of a late frost.

USDA Zone Info for Pierre

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 Pierre

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