One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You can estimate when it's a good idea to plant calla lily in Zone 1a by looking at 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.

Calla Lily require warm weather which means that you must wait until it warms up after all chance of frost has passed before you can plant them.

The earliest that you can plant calla lily in Zone 1a is June. However, you really should wait until July 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 July. Any later than that and your calla lily may not have a chance to grow to maturity. Starting your calla lily indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

The average date of last frost is June 15 in Zone 1a. You can expect an average low temperature of -60°F in the coldest months of winter.

It's important to remember that USDA zone info for Zone 1a is just an average and the actual date of last frost will vary from year to year. Since half of the time in Zone 1a you get a frost after June 15 be ready to cover your calla lily in the event of one of those late frosts.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-60°F
Highest Expected Low	-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in your other planting guides for Zone 1a.