One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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.

In San Ramon you can estimate when to plant garden mums by referring to the USDA zone info.

Planting Calendar for Garden Mums

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

Garden Mums do well in moderate cold which means that you can plant them earlier than plants that are more sensitive to the cold.

The earliest that you can plant garden mums in San Ramon 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 garden mums and expect a good harvest is probably October. If you wait any later than that and your garden mums may not have a chance to grow to maturity. Starting your garden mums indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost has passed is on February 15 in San Ramon. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for San Ramon is not always accurate the actual date of last frost will vary from year to year. Since half of the time in San Ramon last frost occurs after February 15 be ready to protect your garden mums in the event of one of those late frosts.

USDA Zone Info for San Ramon

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 San Ramon

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