The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. 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 getting a good idea when it's a good idea to plant cerastium is to look at the USDA zone info for Umatilla.

Planting Calendar for Cerastium

Frost tolerance for cerastium:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since cerastium are moderately cold tolerant you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant cerastium in Umatilla is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant cerastium and expect a good harvest is probably September. Any later than that and your cerastium may not have a chance to fully mature. If you are starting your cerastium indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Umatilla. You can expect an average low temperature of 5°F in the coldest months of winter.

Since the USDA zone info for Umatilla is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Umatilla it frosts late in the year after April 15 so be sure to be ready to protect your cerastium if you have a late frost.

USDA Zone Info for Umatilla

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°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 10°F.

Plants to Grow in Umatilla

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