Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Jamestown you can determine when it's possible to plant trailing portulaca by using the USDA zone info.

Planting Calendar for Trailing Portulaca

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

You should not plant trailing portulaca until after the last frost because they are not cold tolerant.

The earliest that you can plant trailing portulaca in Jamestown is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant trailing portulaca and expect a good harvest is probably August. If you wait any later than that and your trailing portulaca may not have a chance to grow to maturity. You can get started a little bit earlier by starting your trailing portulaca indoors.

Last Frost Date

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

Remember that USDA zone info for Jamestown may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Since half of the time in Jamestown it frosts late in the year after May 15 be ready to cover your trailing portulaca in the event of one of those late frosts.

USDA Zone Info for Jamestown

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 Jamestown

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