By month
What to plant, month by month
Twelve months, each answered twice — once for the northern hemisphere and once for the southern, because they are half a year apart and every generic planting calendar quietly assumes one of them.
Which is why each month page carries two lists rather than one.
The same month, two seasons
A calendar month is a poor unit for a planting decision, and it is worth saying why before you follow one of the links above. Frost is what actually decides when a tender crop can go outside, and frost does not respect month boundaries: the last one arrives in March on one side of a county and in May on the other. Two gardens in the same month can be six weeks apart in practice.
Across the equator the mismatch is total. The table above pairs each month with its season in both hemispheres, and the pairs are opposites all the way down — a March list that says “sow tomatoes under cover” is telling an Australian gardener to do it as their season ends. That is why each month page here computes its two lists separately instead of printing one and hoping.
A better unit than a month
The frost date itself. Give the site your town and it stops talking about months altogether: every crop gets a window measured from your own last and first frost, and the windows that are open this week are listed first. That is the page these month guides exist to point at.
Browse by country if you would rather find your town in a list, or read how the frost dates are calculated before you trust any of it.