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.

A common way of determining when it's a good idea to plant cleome is to look at the USDA zone info for Hermiston.

Planting Calendar for Cleome

Frost tolerance for cleome:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since cleome are not cold tolerant you really should wait until after the last frost has passed before you can plant them.

The earliest that you can plant cleome in Hermiston 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 cleome and expect a good harvest is probably August. Any later than that and your cleome may not have a chance to really do well. Starting your cleome indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Hermiston. In the coldest months of winter you can expect an average low temperature of 0°F.

Since the USDA zone info for Hermiston is just an average the actual date of last frost is different every year. Half of the time in Hermiston it frosts late in the year after April 15 so just be sure to be ready to protect your cleome if you have one of those late frosts.

USDA Zone Info for Hermiston

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 Hermiston

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