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.

The earliest that you can plant potatos in Lewistown can be determined by looking at the USDA zone info.

Planting Calendar for Potatos

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

Since potatos are very cold tolerant you can plant them a lot earlier in the year than other frost tender plants.

The earliest that you can plant potatos in Lewistown 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 potatos and expect a good harvest is probably August. You probably don't want to wait any later than that or else your potatos may not have a chance to fully mature. You can get started a little bit earlier by starting your potatos indoors.

Last Frost Date

On average the last frost has passed is on May 15 in Lewistown. In the coldest months of winter you can expect an average low temperature of -30°F.

Remember that USDA zone info for Lewistown is not always accurate and the actual date of last frost is different every year. Since half of the time in Lewistown you get a frost after May 15 be ready to protect your potatos in the event of one of those late frosts.

USDA Zone Info for Lewistown

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 Lewistown

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