Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Santa Rosa you can determine when it's a good idea to plant rhubarb by reviewing the USDA zone info.

Planting Calendar for Rhubarb

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

Rhubarb are moderately cold tolerant which tells us that you can get them planted earlier than more sensitive plants.

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

Last Frost Date

The average date of last frost is February 15 in Santa Rosa. You should expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Santa Rosa may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in Santa Rosa you get surprised by a frost after February 15 be ready to protect your rhubarb if you have a surprise late frost.

USDA Zone Info for Santa Rosa

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 Santa Rosa

You may be interested in your other planting guides for Santa Rosa.