One of the first steps you take when you are estimating 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.

The USDA zone info for Rapid City should be reviewed to figure out when you can plant oregano.

Planting Calendar for Oregano

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

Oregano tend to make it in mild cold which tells us that you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant oregano in Rapid City is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant oregano and expect a good harvest is probably September. Any later than that and your oregano may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your oregano indoors.

Last Frost Date

In Rapid City the average date of last frost happens on April 15. In the coldest months of winter you can expect an average low temperature of -20°F.

It's important to remember that USDA zone info for Rapid City is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Rapid City you get surprised by a frost after April 15 so always be ready to protect your oregano if you have a surprise late frost.

USDA Zone Info for Rapid City

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

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

Plants to Grow in Rapid City

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