When to Plant Thyme in San Ramon, CA

Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. 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 thyme by using the USDA zone info.

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Planting Calendar for Thyme

Frost tolerance for thyme: Very tolerant of frost.
When to plant: Up to 7 weeks before last frost.

Thyme do well in cold which means that you can plant them a quite a bit earlier than other frost tender plants.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant thyme
Possibly ok, but a risky time to plant thyme
Probably not a good time to plant thyme

The earliest that you can plant thyme 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 thyme and expect a good harvest is probably October. Any later than that and your thyme may not have a chance to really do well. If you are starting your thyme indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

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

It's important to remember that the actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for San Ramon and it is different every year. Half of the time in San Ramon you get surprised by a frost after February 15 so just be sure to be ready to cover your thyme 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 Low25°F
Highest Expected Low30°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.