One of the first steps you take when you are figuring out your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Colusa can be reviewed to figure out when it's possible to plant coreopsis.

Planting Calendar for Coreopsis

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

Since coreopsis are one of those plants that can tolerate a little bit of cold weather you can plant them a bit earlier in the year than plants that are more sensitive to the cold.

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

The last month that you can plant coreopsis and expect a good harvest is probably October. If you wait any later than that and your coreopsis may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your coreopsis indoors.

Last Frost Date

The average date of last frost is February 15 in Colusa. In the coldest months of winter you should expect an average low temperature of 25°F.

Remember that USDA zone info for Colusa is an average and the actual date of last frost is different every year. Since half of the time in Colusa there is a last frost after February 15 be ready to protect your coreopsis in the event of one of those late frosts.

USDA Zone Info for Colusa

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Colusa

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