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What with weather conditionsWhat with weather conditions (not just now but since you planted) and the potential variability of any given area, we can't say exactly. Watch for the tops to become yellow and begin to fall over. Stomp (per our advice on this page) and pull the onions when the tops are brown. Here in New Hampshire, that's usually in late summer.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?