In Southern Oregon’s Rogue Valley, you can plant the following veggies in July and August for fall & winter harvesting:

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Brussels sprouts – all month through August
Chinese Cabbage – Until August 10^th (later is better to help mitigate cabbage maggot damage)
Late (purple) broccoli-  To over-winter and harvest in March/April

Direct Seed:
Winter beets – after 7/15 through 8/15, plant in 1-2 week intervals
Late broccoli (purple) – Can be direct seeded, too.
Chinese Cabbage – all month to 8/15 (later is better to help mitigate cabbage maggot damage)
Kale – 7/15 through 9/20 for October and winter harvest
Turnips- August all month for late September-October harvest
Bush Beans –  For September – October harvest
Winter variety carrots – 7/15 – 7/31 – harvest in October and all winter ( not Nantes )
Cauliflower –  to 7/15
Mid-season Leaf Lettuce – all month
Parsnips– to 7/15 to dig after hard frost and all winter
Enation-resistant Peas – all month, mulch to keep plants roots cool
Rutabaga – all month, for September harvest
Scallions – to 7/15 to pull all winter.

Transplant:
Fall Broccoli – 7/15 -8/10
Late Cabbage– 7/15 – 8/31
Late Cauliflower – 7/15 to 7/21

Information from: Gardening Year ‘Round , Month by Month in the Rouge Valley, A guide to Family Food Production by the Jackson County Master Gardeners Association