Tools

Trim cycle tracker.

Trim on a calendar, not on how the foot looks. By the time a foot obviously needs doing it has been working a long lever for a fortnight.

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Picking a cycle

What to set it to

SituationUsual interval
Shod horse in work4 to 6 weeks
Barefoot horse in regular work4 to 6 weeks
Barefoot, light use or turned out6 to 8 weeks
Very light use, ideal footingUp to 10 to 12 weeks, as an outer limit
Foals and youngstockShorter, and started early
Rehabbing a distorted footShorter, on your farrier's schedule

Feet grow more slowly in cold weather, which is exactly why people let the cycle stretch over winter and how horses quietly get behind. Slower growth is still growth, and the mechanics of a long foot do not care what month it is. The full hoof guide is here.