One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. 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 figuring out when you can plant calla lily is to consult the USDA zone info for Mount Vernon.

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 it's important to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant calla lily in Mount Vernon 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. You probably don't want to wait any later than that or else 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 little bit earlier.

Last Frost Date

On average the last frost is on March 15 in Mount Vernon. In the coldest months of winter you can expect an average low temperature of 10°F.

Since the USDA zone info for Mount Vernon is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Mount Vernon you get surprised by a frost after March 15 so just be sure to be ready to protect your calla lily if you have a surprise late frost.

USDA Zone Info for Mount Vernon

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Mount Vernon

You may be interested in your other planting guides for Mount Vernon.