One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By reviewing the USDA zone info for Hillsboro you should be able to estimate when it's possible to plant oregano.

Planting Calendar for Oregano

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

Since oregano are moderately cold tolerant you can plant them a little bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant oregano in Hillsboro 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. You probably don't want to wait any later than that or else your oregano may not have a chance to really do well. You can get started a little bit earlier by starting your oregano indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Hillsboro. It might get as low as -10°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Hillsboro is just an average and the actual date of last frost changes from year to year. Half of the time in Hillsboro you get a frost after April 15 so make sure that you are prepared to protect your oregano if you have a late frost.

USDA Zone Info for Hillsboro

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Hillsboro

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