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

In Grand Terrace you can figure out when it's a good idea to plant astilbe by looking at the USDA zone info.

Planting Calendar for Astilbe

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

Astilbe do ok in some cold which means that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant astilbe in Grand Terrace 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 astilbe and expect a good harvest is probably September. If you wait any later than that and your astilbe may not have a chance to grow to maturity. If you are starting your astilbe indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Grand Terrace. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for Grand Terrace is an average the actual date of last frost changes from year to year. Since half of the time in Grand Terrace last frost occurs after February 15 be ready to protect your astilbe if you have a surprise late frost.

USDA Zone Info for Grand Terrace

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 Grand Terrace

You may be interested in your other planting guides for Grand Terrace.