The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Bristol can be looked at to determine when it's possible to plant nierembergia.

Planting Calendar for Nierembergia

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

It's probably not a good idea to plant nierembergia until after the last frost has passed because they require warm weather.

The earliest that you can plant nierembergia in Bristol 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 nierembergia and expect a good harvest is probably August. Any later than that and your nierembergia may not have a chance to really do well. If you are starting your nierembergia indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Bristol. In the coldest months of winter you can expect an average low temperature of -5°F.

It's important to remember that USDA zone info for Bristol is just an average and the actual date of last frost will vary from year to year. Since half of the time in Bristol you get surprised by a frost after April 15 be ready to cover your nierembergia in the event of a surprise late frost.

USDA Zone Info for Bristol

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 Bristol

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