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.

You should be able to estimate when it's the best time to plant sedum by using the USDA zone info for Herrin.

Planting Calendar for Sedum

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

Since sedum are very cold tolerant you can plant them much earlier in the year than more sensitive plants.

The earliest that you can plant sedum in Herrin 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 sedum and expect a good harvest is probably September. You probably don't want to wait any later than that or else your sedum may not have a chance to really do well. You can get started a little bit earlier by starting your sedum indoors.

Last Frost Date

On average the last frost is on April 15 in Herrin. It might get as low as -5°F during the coldest months of winter.

Since the USDA zone info for Herrin is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Herrin last frost occurs after April 15 so just be sure to be ready to protect your sedum if you have one of those late frosts.

USDA Zone Info for Herrin

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Herrin

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