Winter fish care begins before the pond freezes. As fall water temperatures drop, koi and other pond fish eat and digest differently. The most useful guide for changing their feeding routine is the temperature of the pond water, not the date on the calendar or how eagerly they swim toward you.
Watch the water temperature as fall turns to winter
Check the pond water regularly during the seasonal change. Air temperature can swing from day to day, while the water is what your fish actually live in. Use a pond thermometer to decide when to adjust feeding; this guide does not depend on a particular thermometer or app.
What should you feed when the water reaches 60°F to 50°F?
As the water cools through this range, ease back on both the amount and frequency of feeding. Transition to a fish food labeled for cold-water feeding, following that food's own instructions. Offer only a small amount your fish will eat promptly, and remove leftovers so uneaten food does not add to the pond's waste load.
Don't make a sudden feeding decision based on one warm afternoon. Keep checking the water and adjust your routine as the season changes.
When should you stop feeding pond fish?
When pond water drops below 50°F, stop feeding. Their digestion slows in cold water, and food they do not eat can affect water quality. Fish may still move around or come to the surface; activity alone is not a reliable reason to resume feeding below that threshold.
When spring arrives, keep monitoring the water before returning to a warmer-season feeding routine. Use the directions on your fish food rather than assuming that a sunny day means the pond has warmed enough.
Keep feeding advice in context
Food is one part of preparing a fish pond for cold weather. For the other seasonal pond steps, read Tips for Winterizing Your Pond. For more pond-care guides, visit the PondScape Learning Center. If fish appear unwell, seek advice from a qualified aquatic veterinarian rather than trying to solve a health problem by changing food alone.
In short: Track pond water temperature, taper feeding as it cools from 60°F toward 50°F, and stop feeding below 50°F. Keep portions modest and clear away leftovers.