Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of estimating when it's possible to plant trailing portulaca is to refer to the USDA zone info for Oregon City.

Planting Calendar for Trailing Portulaca

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

It's probably a bad idea to plant trailing portulaca until after the last frost has passed because they require warm weather.

The earliest that you can plant trailing portulaca in Oregon City is April. However, you really should wait until May 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. Any later than that and your trailing portulaca may not have a chance to really do well. You can get started a couple of weeks earlier by starting your trailing portulaca indoors.

Last Frost Date

In Oregon City the average date of last frost happens on March 15. It might get as low as 15°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Oregon City is an average and the actual date of last frost will vary from year to year. Half of the time in Oregon City last frost occurs after March 15 so make sure that you are prepared to protect your trailing portulaca in the event of a surprise late frost.

USDA Zone Info for Oregon City

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Oregon City

You may be interested in your other planting guides for Oregon City.