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.

One way of getting a good idea when you can plant lithospermum is to refer to the USDA zone info for Elkhorn.

Planting Calendar for Lithospermum

Frost tolerance for lithospermum:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You should not plant lithospermum until after the last frost because they do not do well in cold weather.

The earliest that you can plant lithospermum in Elkhorn 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 lithospermum and expect a good harvest is probably August. If you wait any later than that and your lithospermum may not have a chance to really do well. If you are starting your lithospermum indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Elkhorn. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Elkhorn is not always accurate the actual date of last frost changes from year to year. Since half of the time in Elkhorn it frosts late in the year after April 15 be ready to protect your lithospermum in the event of one of those late frosts.

USDA Zone Info for Elkhorn

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

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

Plants to Grow in Elkhorn

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