One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first opportunity to plant cerastium in Riverton should be determined by reviewing the USDA zone info.

Planting Calendar for Cerastium

Frost tolerance for cerastium:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since cerastium do well in moderate cold you can plant them a bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant cerastium in Riverton 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 cerastium and expect a good harvest is probably August. Any later than that and your cerastium may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your cerastium indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Riverton. In the coldest months of winter you should expect an average low temperature of -25°F.

Since the USDA zone info for Riverton is just an average the actual date of last frost changes from year to year. Since half of the time in Riverton there is a last frost after May 15 be ready to cover your cerastium if you have a surprise late frost.

USDA Zone Info for Riverton

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Riverton

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