The USDA Zone info is a great tool for gardeners to help us determine 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.

It's possible to determine when it's the best time to plant coleus by referring to the USDA zone info for Rock Springs.

Planting Calendar for Coleus

Frost tolerance for coleus:	Not tolerant of frost.
When to plant:	After the last frost.

It's not a good idea to plant coleus until after the last frost because they do not do well in cold weather.

The earliest that you can plant coleus in Rock Springs is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant coleus and expect a good harvest is probably August. You probably don't want to wait any later than that or else your coleus may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your coleus indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Rock Springs. You can expect an average low temperature of -20°F in the coldest months of winter.

Remember that USDA zone info for Rock Springs is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Rock Springs it frosts late in the year after April 15 be ready to cover your coleus if you have a surprise late frost.

USDA Zone Info for Rock Springs

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°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 -15°F.

Plants to Grow in Rock Springs

You may be interested in your other planting guides for Rock Springs.