One of the best tools that you have as gardeners to help us estimate 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.

The USDA zone info for Happy Valley should be reffered to in order to determine when it's the best time to plant calla lily.

Planting Calendar for Calla Lily

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

Calla Lily are not cold tolerant which means that you need to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant calla lily in Happy Valley 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 fully mature. 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 March 15 in Happy Valley. In the coldest months of winter you can expect an average low temperature of 15°F.

Since the USDA zone info for Happy Valley is not always accurate the actual date of last frost will vary from year to year. Half of the time in Happy Valley it frosts late in the year after March 15 so be sure to be ready to cover your calla lily in the event of a surprise late frost.

USDA Zone Info for Happy Valley

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Happy Valley

You may be interested in your other planting guides for Happy Valley.