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.

In Kennewick you can figure out 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 all chance of frost has passed.

It's a bad idea to plant calla lily until after the last frost because they are not cold tolerant.

The earliest that you can plant calla lily in Kennewick 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 really do well. Starting your calla lily indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on April 15 in Kennewick. In the coldest months of winter you can expect an average low temperature of 0°F.

It's important to remember that USDA zone info for Kennewick may not be accurate from year to year and the actual date of last frost changes from year to year. Half of the time in Kennewick there is a last frost after April 15 so just be sure to be ready to cover your calla lily if you have one of those late frosts.

USDA Zone Info for Kennewick

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Kennewick

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