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.

By referring to the USDA zone info for Williston you will be able to figure out when to plant pansies.

Planting Calendar for Pansies

Frost tolerance for pansies:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

You can plant pansies quite a bit earlier in the year because they are very cold tolerant.

The earliest that you can plant pansies in Williston 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 pansies and expect a good harvest is probably August. You probably don't want to wait any later than that or else your pansies may not have a chance to really do well. Starting your pansies indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Williston the average date of last frost happens on May 15. In the coldest months of winter you can expect an average low temperature of -30°F.

Keep in mind that USDA zone info for Williston is an average and the actual date of last frost changes from year to year. Half of the time in Williston there is a last frost after May 15 so always be ready to protect your pansies in the event of a surprise late frost.

USDA Zone Info for Williston

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Williston

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