Why the thermometer sets the menu
Koi are cold-blooded, so the pond's temperature governs how fast they can digest a meal. Warm water speeds their gut up and cold water slows it almost to a standstill, which is why the same handful of pellets can be a sensible summer meal and a harmful winter one. Undigested food passed in cold weather also fouls the water at exactly the time of year when filtration is running at its slowest. Feed to the thermometer on the pond wall, read alongside the fish's own enthusiasm at the surface, rather than to dates printed on a calendar — a late cold snap in spring deserves the same caution as autumn.
Spring: restarting a sleeping gut
As the water climbs out of its winter low, begin with tiny offerings of light, easily digested food, and only on days when the fish come looking. The pond's filter bacteria are waking up just as slowly as the koi are, so early restraint protects water quality while both recover. Increase the amount gradually over several weeks as temperatures hold, watching that everything offered is cleared within a few minutes. Spring is also the moment to check body condition after the winter fast: fish that come up thin or sluggish need observation and clean water first, not a rush of rich food.
Summer: the growing season
In settled warm water, koi feed with real appetite and convert food into growth. Several modest meals spread across the day suit them better than one heavy dump, because each portion is eaten cleanly and the filter faces a steadier load. This is the season for the protein-rich growth foods, offered while the water is warm enough for the fish to use them fully. Keep an eye on the pond after feeding on still, thundery days, when oxygen runs low, and skip a meal rather than feed into water the fish are already struggling to breathe in.
Autumn and winter: tapering down to rest
As the water cools, step the protein down first, moving to lighter wheatgerm-style foods that a slowing gut can still handle, and reduce how often you feed as the fish show less interest. Below the point where they stop rising for food altogether, stop offering it: a koi resting in cold water lives on its reserves, and pellets sinking uneaten only rot on the pond floor. Leave the fish undisturbed through the coldest weeks, keep a hole in any ice for gases to escape, and resist the kind-hearted extra meal on one mild afternoon — it is the swing, not the cold itself, that causes trouble.
When several people feed the pond across the seasons, KinsLe's Care Teams can assign each feeding duty to a named helper, and every finished feeding is timestamped when done.