The USDA Zone info is a great tool for gardeners to help us determine 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.

By using the USDA zone info for Sonoma you should be able to determine when to plant geranium.

Planting Calendar for Geranium

Frost tolerance for geranium:	Not tolerant of frost.
When to plant:	After the last frost.

You can not plant geranium until after the last frost when the weather gets warmer because they are not cold tolerant.

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

The last month that you can plant geranium and expect a good harvest is probably September. If you wait any later than that and your geranium may not have a chance to fully mature. If you are starting your geranium 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 February 15 in Sonoma. It might get as low as 25°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Sonoma is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Sonoma you get surprised by a frost after February 15 so make sure that you are prepared to protect your geranium if you have a late frost.

USDA Zone Info for Sonoma

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 Sonoma

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