Unwashed farm eggs do not need refrigeration and stay good on the counter for about two weeks. Once you wash an egg, you must refrigerate it. The bloom, a thin natural coating, is what makes the difference.
The one rule that matters
If the egg still has its bloom intact, room temperature is fine. If the bloom has been washed off, it must go in the fridge. That is the whole rule.
What the bloom actually does
Every hen lays an egg wet, and within seconds a coating of protein and glycoprotein dries onto the shell. That coating seals thousands of tiny pores against bacteria and slows moisture loss. Eggshells are more porous than most people realize, which is why an unprotected egg spoils fast.
Why the United States refrigerates eggs
Since the 1970s, USDA-graded egg operations have been required to wash and sanitize eggs before sale. The rule was written to fight salmonella contamination on the outside of the shell. It works, but it strips the bloom and forces refrigeration for the rest of the egg's life.
Most of Europe does the opposite. Hens are vaccinated for salmonella and eggs are sold unwashed at room temperature. Both systems produce safe eggs.
What we do at our farm
We collect eggs several times a day and inspect each one. Clean eggs go straight into the carton with the bloom intact. Any egg with visible dirt gets a gentle dry brush or, if it needs it, a quick warm water rinse. Rinsed eggs are marked and go to the fridge.
Storing eggs the right way
Shortcut: when in doubt, use the float test
Fresh eggs sink. Old eggs float. It works regardless of storage method.
