The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Castle Rock you can determine when to plant pennisetum by checking out the USDA zone info.

Planting Calendar for Pennisetum

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

Since pennisetum are one of those plants that can tolerate a tiny bit of cold weather you can plant them slightly earlier in the year than other frost tender plants.

The earliest that you can plant pennisetum in Castle Rock 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 pennisetum and expect a good harvest is probably August. Any later than that and your pennisetum may not have a chance to really do well. You can get started a couple of weeks earlier by starting your pennisetum indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Castle Rock. In the coldest months of winter you can expect an average low temperature of -15°F.

Since the USDA zone info for Castle Rock may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in Castle Rock there is a last frost after April 15 be ready to protect your pennisetum if you have a late frost.

USDA Zone Info for Castle Rock

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Castle Rock

You may be interested in your other planting guides for Castle Rock.