One of the first steps you take when you are estimating 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 first chance to plant geranium in Zone 10b should be figured out by referring to the USDA zone info.

Planting Calendar for Geranium

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

Geranium are not cold tolerant which tells us that you have to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant geranium in Zone 10b 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 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 really do well. You can get started a little bit earlier by starting your geranium indoors.

Last Frost Date

In Zone 10b the average date of last frost happens on January 31. In the coldest months of winter you can expect an average low temperature of 35°F.

Keep in mind that USDA zone info for Zone 10b is an average and the actual date of last frost will vary from year to year. Since half of the time in Zone 10b there is a last frost after January 31 be ready to protect your geranium if you have a surprise late frost.

USDA Zone Info for Zone 10b

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	35°F
Highest Expected Low	40°F

This means that on a really cold year, the coldest it will get is 35°F. On most years you should be prepared to experience lows near 40°F.

Plants to Grow in Zone 10b

You may be interested in your other planting guides for Zone 10b.