One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Williston you can estimate when to plant oriental poppies by looking at the USDA zone info.

Planting Calendar for Oriental poppies

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

Since oriental poppies do well in moderate cold you can plant them a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant oriental poppies 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 oriental poppies and expect a good harvest is probably August. You probably don't want to wait any later than that or else your oriental poppies may not have a chance to really do well. You can get started a couple of weeks earlier by starting your oriental poppies indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Williston. You should expect an average low temperature of -30°F in the coldest months of winter.

Since the USDA zone info for Williston is an average the actual date of last frost will vary from year to year. Half of the time in Williston you get a frost after May 15 so be sure to be ready to protect your oriental poppies in the event of a 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.