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.

You should be able to estimate when it's possible to plant violas by referring to the USDA zone info for Eureka.

Planting Calendar for Violas

Frost tolerance for violas:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

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

The earliest that you can plant violas in Eureka 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 violas and expect a good harvest is probably October. Any later than that and your violas may not have a chance to fully mature. Starting your violas indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Eureka. You should expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Eureka is an average the actual date of last frost is different every year. Half of the time in Eureka last frost occurs after February 15 so make sure that you are prepared to protect your violas in the event of one of those late frosts.

USDA Zone Info for Eureka

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 Eureka

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