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

The best time to plant geranium in San Dimas can be estimated by looking at the USDA zone info.

Planting Calendar for Geranium

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

It's a bad idea to plant geranium until after the last frost because they require warm weather.

The earliest that you can plant geranium in San Dimas 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. Any later than that and your geranium may not have a chance to fully mature. Starting your geranium indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost has passed is on January 31 in San Dimas. You can expect an average low temperature of 30°F in the coldest months of winter.

Always keep in mind that USDA zone info for San Dimas is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in San Dimas you get a frost after January 31 so always be ready to cover your geranium if you have one of those late frosts.

USDA Zone Info for San Dimas

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in San Dimas

You may be interested in your other planting guides for San Dimas.