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

The USDA zone info for Warrenton should be reffered to in order to figure out when it's a good idea to plant canna.

Planting Calendar for Canna

Frost tolerance for canna:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since canna are not cold tolerant it's necessary to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant canna in Warrenton 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 canna and expect a good harvest is probably September. You probably don't want to wait any later than that or else your canna may not have a chance to fully mature. Starting your canna indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Warrenton. In the coldest months of winter you should expect an average low temperature of 20°F.

It's important to remember that USDA zone info for Warrenton may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Warrenton you get a frost after February 15 so make sure that you are ready to cover your canna in the event of one of those late frosts.

USDA Zone Info for Warrenton

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 Warrenton

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