The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In River Rouge you can figure out when it's possible to plant salsify by looking at the USDA zone info.

Planting Calendar for Salsify

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

Salsify do ok in moderate cold which tells us that you can plant them slightly earlier than plants that are more sensitive to the cold.

The earliest that you can plant salsify in River Rouge 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 salsify and expect a good harvest is probably August. Any later than that and your salsify may not have a chance to fully mature. Starting your salsify indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in River Rouge. You should expect an average low temperature of -5°F in the coldest months of winter.

Since the USDA zone info for River Rouge is an average the actual date of last frost will vary from year to year. Half of the time in River Rouge you get surprised by a frost after April 15 so be sure to be ready to cover your salsify in the event of one of those late frosts.

USDA Zone Info for River Rouge

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 River Rouge

You may be interested in your other planting guides for River Rouge.