Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Redwood City you can determine when it's the best time to plant purple coneflower by looking at the USDA zone info.

Planting Calendar for Purple Coneflower

Frost tolerance for purple coneflower:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Purple Coneflower are one of those plants that can tolerate a tiny bit of cold weather which tells us that you can start planting them slightly earlier than other frost tender plants.

The earliest that you can plant purple coneflower in Redwood City 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 purple coneflower and expect a good harvest is probably September. Any later than that and your purple coneflower may not have a chance to really do well. Starting your purple coneflower indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

Just be sure to remember that USDA zone info for Redwood City is just an average and the actual date of last frost changes from year to year. Half of the time in Redwood City there is a last frost after February 15 so always be ready to protect your purple coneflower in the event of one of those late frosts.

USDA Zone Info for Redwood City

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 Redwood City

You may be interested in your other planting guides for Redwood City.