Hello Robert,
Thank you for your question about growing herbs in your raised planter. The following publications provide information about preparing your planter and recommended soils:
Raised Bed Gardening | OSU Extension Service (oregonstate.edu)

Growing Vegetables in Central Oregon (Crook, Deschutes, and Jefferson counties) | OSU Extension Service (oregonstate.edu)

You can grow a variety of herbs in Central Oregon. Many herbs can be grown through the summer, but you will want to select varieties hardy to USDA Zones 3-4 to have them overwinter.

Herbs that are frost sensitive can be planted about the second week in June. Have frost protection on hand given that our climate can be unpredictable. Herbs that grow well in Central Oregon include oregano, thyme, lemon balm, mints, and parsley.

“Like warm-season vegetables, herbs considered “warm season” thrive best when air and soil temperatures are consistently above 60ºF. Herbs benefit from cold night protection in the same way that vegetables do. Herb gardeners often remove developing buds from plants to prolong the length of time leaves can be harvested.”
Source: Herbs are easy to grow and have many uses | OSU Extension Service (oregonstate.edu)

Five cold-hardy herbs to grow at home | OSU Extension Service (oregonstate.edu)

The OSU Deschutes County Extension website provides many helpful publications about gardening in Central Oregon. Following is a link to this website, which will direct you to a variety of gardening topics specific for our geographic area and climate.
Central Oregon Garden Publications | OSU Extension Service (oregonstate.edu)

If you need additional information, I recommend you call the Deschutes County OSU Extension office in Redmond at<personal data hidden>. Ask to speak with Amy Jo Detweiler (oregonstate.edu), a member of the Horticulture Staff. Amy Jo welcomes your home garden questions and is a great resource.