35-60 days. The Golden Detroit is an easy to grow beet that can be harvested as early as fifty days after planting, and thrives in colder weather. The Golden Detroit has a sweet taste, and is full of nutrients. It is recommended that you harvest the beets when the roots are one to three inches, for best flavor. The stalks of this root vegetable remain dark green like other strains of beets, but the vein adorn a brighter red and orange shade. This garden vegetable will produce deep orange and yellow beetroots that have several diverse culinary applications.