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Harvest, Storage & Post-Harvest TimingDetermining Harvest Readiness by Crop
Seed packets give days to maturity, but the plant itself gives the final answer. This guide covers the cues that tell you a crop is ready, grouped by what part of the plant you are eating.
Key points
- Use days to maturity as a signal to start checking, not as the pick date.
- Immature-fruit crops need frequent picking to keep producing.
- Ripe-fruit crops are judged by color, rind hardness or ease of separation.
- Dig or pull a test sample of root and bulb crops before harvesting the lot.
Why not just count days to maturity?
Days to maturity is an estimate based on average conditions. A cool spring, a dry spell or a crowded bed can add a week or more, and a hot stretch can take days off. Treat the packet number as the time to start watching, not the date to start picking.
The most reliable habit is to walk the planting every day or two once the window opens. Look, feel, and sample a few before you commit to the whole row.
For example, if a packet says 60 days and your seedlings went in during a cold week, begin checking at day 60 but expect the first good picks closer to day 68. Write down the day you actually saw the cue, and next year your estimate will be closer.
How do you judge crops where you eat the immature fruit?
Some crops are picked before they finish growing. Iowa State University Extension describes snap beans as ready when pods are about as thick as a pencil, and summer squash as ready while the skin is still soft. Cucumbers are picked at the size that suits their use, with a short piece of stem left on, and all three need picking every couple of days once production starts.
If you leave these crops too long, the plant slows down because it thinks its job is done. Regular picking is the cue that keeps new fruit coming.
- Snap beans: pencil-thick pods, seeds still small
- Summer squash: soft skin, picked often
- Cucumbers: target size for slicing or pickling, picked every few days
- Sweet corn: milky juice when a kernel is punctured
How do you judge crops where you eat the ripe fruit?
Tomatoes, melons and winter squash are different: flavor and storage quality come from letting them finish on the plant. Fully colored tomatoes give the best flavor. Winter squash is ready when the rind is hard enough that a fingernail does not puncture it, and pumpkins when they have turned a uniform color.
Melons vary by type. Cantaloupes are typically ready when the stem separates easily from the fruit, while watermelons show a change in the color of the spot where they touched the ground. Honeydews soften slightly at the blossom end. Check your extension guide for the type you grow.
How do you judge root, bulb and tuber crops?
Underground crops are harder because you cannot see them. Carrots often show shoulders at the soil surface, and beets and turnips are best at a moderate size rather than the largest possible. Pull one and look.
For onions and garlic, watch the tops. Onions are ready when the tops fall over and start to dry, and garlic when the foliage falls and dries. Potatoes are ready to dig after the vines brown and die. Digging a test hill before you commit is a quick way to check.
If you are unsure about a variety, ask the seed company or your extension office what size and appearance it should have at maturity. Varieties of the same crop can look quite different when ripe.
How do you judge leaves, heads and flower buds?
Leafy crops are picked while tender. Outer leaves of leaf lettuce can be picked repeatedly, while heat makes lettuce bitter and pushes it to bolt. Broccoli is cut before the yellow flower buds open, and cabbage when heads feel firm and full. If the head cracks, the plant has gone past its best.
Time of day matters for quality. Picking in the cool of the morning keeps leaves crisp, and getting them into shade quickly helps them stay that way.
Cauliflower is a good example of a crop where watching matters: heads grow quickly in warm weather and can go from perfect to loose and ricey in a few days. Check heads daily as they near full size, and cut them while the curds are still tight.
What mistakes should you watch for?
Picking too early gives poor flavor and, for storage crops, poor keeping. Picking too late gives tough, woody, bitter or split produce. Both are common when growers rely on a calendar.
Keep a short notebook with the cue you used and what you thought of the result. Within a season or two, you will know the signs for your own varieties better than any chart can tell you. When the cue is not clear for a variety you are trying, your county extension office can help.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.