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 first chance to plant marigold in Atherton can be determined by referring to the USDA zone info.

Planting Calendar for Marigold

Frost tolerance for marigold:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since marigold require warm weather it's important to wait until after the last frost before you can plant them.

The earliest that you can plant marigold in Atherton is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant marigold and expect a good harvest is probably September. Any later than that and your marigold may not have a chance to really do well. You can get started a few weeks earlier by starting your marigold indoors.

Last Frost Date

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

Just be sure to remember that USDA zone info for Atherton is not always accurate and the actual date of last frost changes from year to year. Since half of the time in Atherton you get a frost after February 15 be ready to cover your marigold in the event of a late frost.

USDA Zone Info for Atherton

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 Atherton

You may be interested in your other planting guides for Atherton.