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.

In Rock Springs you can determine when you can plant calla lily by reviewing the USDA zone info.

Planting Calendar for Calla Lily

Frost tolerance for calla lily:	Not tolerant of frost.
When to plant:	After the last frost has passed.

It's probably not a good idea to plant calla lily until after all chance of frost has passed because they require warm weather.

The earliest that you can plant calla lily in Rock Springs 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 calla lily and expect a good harvest is probably August. Any later than that and your calla lily may not have a chance to fully mature. You can get started a little bit earlier by starting your calla lily indoors.

Last Frost Date

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

Just be sure to remember that USDA zone info for Rock Springs may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Rock Springs there is a last frost after April 15 so be sure to be ready to protect your calla lily if you have one of those late frosts.

USDA Zone Info for Rock Springs

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 Rock Springs

You may be interested in your other planting guides for Rock Springs.