This free cold frame size planner gives you a cold frame sized from your bed width and crop height. Enter a few simple details about your garden, and the tool works out a clear plan you can follow straight away, without any sign-up or special knowledge.
To use the tool, start with the size of your garden or the number of beds you have. Real numbers give real plans: a plan for a tiny balcony bed is very different from a plan for a large backyard plot, even when both gardens grow the same crops.
Next, answer the questions about your garden conditions, such as sun, rainfall, frost, or bed size. These details are what turn a generic list into a plan for your garden. Two gardens in the same town can need different plans, because one sits behind a warm wall and the other sits in a windy, shady corner.
Read the results slowly and write down the first three jobs. A plan only helps if it leaves the screen and reaches the garden. A short list on the fridge or by the back door beats a long printout filed away and forgotten.
Work through the plan one job at a time, in the order given. Garden plans work best when jobs happen in sequence: prepare the soil before you sow, sow before you feed, and harvest before crops go over. Skipping ahead usually creates extra work later.
Repeat the plan on a regular rhythm. Gardens change every week as plants grow, seasons shift, and weather turns. Re-running the tool with fresh numbers each month, or each season, keeps the plan honest and matched to what is actually happening outside.
A cold frame works like a small unheated greenhouse at ground level. Its glass or clear lid traps daytime heat, and the low walls shelter seedlings from wind, giving you weeks of extra growing season.
Height matters more than most people expect. A frame built for low lettuce will crush tall tomato seedlings in a week, while a frame built far too tall loses heat and wastes materials. Measure your tallest crop at full seedling height, then add room for growth before you cut any timber.
Vent on sunny days, even in winter. A closed cold frame in bright sun can overheat fast and cook seedlings that survived frost all night. Prop the lid open a little on sunny mornings and close it before evening, so the trapped heat stays for the cold night.
A common mistake is planning only for spring. Spring is exciting, but summer watering, autumn clearing, and winter protection matter just as much. A year-round plan, even a simple one, keeps the garden productive in every season instead of only in the first warm weeks.
Check your plan against what you see outside before you buy materials. Measure the bed again, look at the sun at different times of day, and feel the soil after rain. A quick check on the ground catches the small errors that a screen cannot see, and it saves money on cloth, timber, or plastic bought in the wrong size.
Keep notes as you go. Write down what you planted, when it went in, and how it did. Next year, those notes turn a good plan into a great one, because you will know which crops loved your soil and which ones struggled in your shade or wind.
Remember that this tool gives general garden guidance, not advice for a farm or a commercial crop. Your local soil, weather, and varieties all shift real results. Use the plan as a strong starting point, watch your plants, and adjust over a few weeks until the routine fits your garden.
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