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

In Riverdale you can figure out when it's possible to plant torch lilys by reviewing the USDA zone info.

Planting Calendar for Torch Lilys

Frost tolerance for torch lilys:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since torch lilys do well in cold you can plant them a lot earlier in the year than more sensitive plants.

The earliest that you can plant torch lilys in Riverdale 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 torch lilys and expect a good harvest is probably September. You probably don't want to wait any later than that or else your torch lilys may not have a chance to grow to maturity. If you are starting your torch lilys indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is March 15 in Riverdale. In the coldest months of winter you should expect an average low temperature of 10°F.

Since the USDA zone info for Riverdale is an average the actual date of last frost changes from year to year. Half of the time in Riverdale there is a last frost after March 15 so always be ready to cover your torch lilys in the event of one of those late frosts.

USDA Zone Info for Riverdale

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

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

Plants to Grow in Riverdale

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