One of the best tools that you have as gardeners to help us estimate 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.

You should be able to estimate when to plant tropical hibiscus by referring to the USDA zone info for Calistoga.

Planting Calendar for Tropical Hibiscus

Frost tolerance for tropical hibiscus:	Not tolerant of frost.
When to plant:	After the last frost.

Tropical Hibiscus do not do well in cold weather which tells us that you really should wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant tropical hibiscus in Calistoga 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 tropical hibiscus and expect a good harvest is probably September. If you wait any later than that and your tropical hibiscus may not have a chance to grow to maturity. You can get started a little bit earlier by starting your tropical hibiscus indoors.

Last Frost Date

On average the last frost has passed is on February 15 in Calistoga. You should expect an average low temperature of 20°F in the coldest months of winter.

Remember that USDA zone info for Calistoga is just an average and the actual date of last frost is different every year. Since half of the time in Calistoga it frosts late in the year after February 15 be ready to cover your tropical hibiscus if you have a surprise late frost.

USDA Zone Info for Calistoga

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Calistoga

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