CalculatorMulchWhen should I mulch?
Mulch laid too early in spring keeps the soil cold; too late and the weeds are already up. The window is a few weeks wide and it moves with your climate, not the calendar.
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How this works
When to mulch
The window depends on soil temperature, not on the date.
| Season | When | Why then |
|---|---|---|
| Spring | Once perennials are a few inches up | Soil has warmed; weeds have not germinated |
| Early summer | After the first thorough weeding | Locks in moisture before the dry spell |
| Autumn, for winter protection | After the ground begins to freeze | Mulching warm soil invites rodents to nest |
| Not at all | Over frozen ground with no need | Keeps the soil cold well into spring |
Soil temperature varies more within a country than between neighbouring ones, so your own record beats any zone map.
Frequently asked questions
When is the right time in spring?
After the soil has warmed but before weeds germinate. In practice that is when perennials are a few inches up — mulching over cold, wet soil slows everything down.
Should I mulch in autumn as well?
For winter protection, yes, but after the ground has begun to freeze rather than before. Mulching warm autumn soil invites rodents to nest in it.