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.

In Richland Center you can figure out when it's the best time to plant portulaca by looking at the USDA zone info.

Planting Calendar for Portulaca

Frost tolerance for portulaca:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since portulaca do not do well in cold weather it is important to wait until after the last frost before you can plant them.

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

Last Frost Date

The average date of last frost is May 15 in Richland Center. It might get as low as -25°F during the coldest months of winter.

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

USDA Zone Info for Richland Center

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Richland Center

You may be interested in your other planting guides for Richland Center.