: If you plan to grow taller crops like kale or leeks, look for a "tall" cold frame design. For simple seedlings and salad greens, a standard 12–24 inch slope is sufficient.
: Your cold frame should face South (in the Northern Hemisphere) to maximize light exposure. Avoid placing it against a South-facing wall in the summer, as it may overheat. 3. Buying vs. DIY buy cold frame
: This is non-negotiable. Sunlight can quickly turn your cold frame into an oven, even in winter. Look for models with adjustable lid props or automatic vent openers that respond to temperature changes. Glazing Material : : If you plan to grow taller crops