How early can you plant potatoes & onions if they are in a greenhouse?
The greenhouse is made out of UV proof plastic and pvc aches.
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You can plant sets about three weeks before you intend to put them in the ground. Seeds would take 3-6 weeks longer. If you plan to raise them in the greenhouse, be sure to have soil at least 2-3 feet deep to let the roots and ulna grow. And hothouse veggies can be grown anytime if you have adequate sunlight and temp control. ☺️
If your greenhouse is heated you can plant/grow them whever you want. Do you mean start them in the greenhouse and then plant them outside when temps permit?
http://www.territorialseed.com/product/14051/fall_winter_growing_guides