Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By referring to the USDA zone info for Yakima you will be able to estimate when it's the best time to plant calliopsis.

Planting Calendar for Calliopsis

Frost tolerance for calliopsis:	Not tolerant of frost.
When to plant:	After the last frost.

Calliopsis require warm weather which tells us that you have to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant calliopsis in Yakima 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 calliopsis and expect a good harvest is probably August. You probably don't want to wait any later than that or else your calliopsis may not have a chance to fully mature. Starting your calliopsis 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 Yakima. It might get as low as -5°F during the coldest months of winter.

Since the USDA zone info for Yakima is not always accurate the actual date of last frost is different every year. Since half of the time in Yakima there is a last frost after April 15 be ready to protect your calliopsis if you have a late frost.

USDA Zone Info for Yakima

Here is the info for USDA Zone 6b.

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

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

Plants to Grow in Yakima

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