Planting & Harvest Dates

Days to Harvest Calculator

Pick a vegetable, enter when you planted it, and choose seed or transplant to estimate your harvest date and how many days are left until it is ready.

Planting method

How to use the days to harvest calculator

Choose your vegetable from the dropdown, enter the date you planted it, and select whether you started it from seed or from transplant. Press Calculate Harvest Date and the tool adds that crop’s days to maturity to your planting date, then counts the days between today and the expected harvest. It is a fast way to plan when to be ready with baskets, jars, and freezer space.

What "days to maturity" really tells you

Days to maturity is the average time a crop needs from its starting point until the first pickable harvest. It is the single most useful number for planning a vegetable garden, but it is an average, not a promise. The figure assumes reasonably good growing conditions, so think of it as the earliest realistic date to begin checking your plants rather than a fixed ripening day. Cool weather and short days early and late in the season tend to stretch the timeline, while warm, sunny stretches can pull it forward.

Seed versus transplant timing

Crops grown from a transplant reach harvest faster than the same crop sown directly in the garden, because the seedling already spent several weeks growing indoors. That is why tomatoes, peppers, broccoli, cabbage, kale, lettuce, and onions show shorter timelines from transplant in this calculator. Crops that resent root disturbance, such as carrots, radishes, beans, corn, peas, and potatoes, are almost always direct sown, so their seed and transplant numbers are identical.

Fast crops and long-season crops

Some vegetables are remarkably quick. Radishes can be ready in about 25 days, and loose-leaf lettuce and spinach in roughly 40 to 45. These are perfect for filling gaps and for succession sowing. At the other extreme, onions need around 100 days from seed and garlic takes about 240 days, spanning fall planting through to a summer harvest the next year. Knowing these spans helps you slot each crop into the season and keep beds productive.

Tips for a well-timed harvest

  • Write the calculated harvest date on a garden marker or calendar so you remember to start checking.
  • Harvest most crops in the cool of the morning, when they are crisp and full of moisture.
  • Pick beans, cucumbers, and zucchini frequently and young to keep the plants producing.
  • Let storage crops like onions, garlic, and winter squash cure before putting them away.
  • Keep notes on the actual dates each year to fine-tune your timing for your own garden.

Frequently Asked Questions

What does "days to maturity" mean?

Days to maturity is the average number of days a vegetable needs to grow before it is ready to harvest. For direct-sown crops the clock usually starts at sowing, while for transplanted crops it starts when the seedling goes into the garden. Seed packets and catalogs list this number for each variety, and the figures in this calculator are typical averages across common varieties.

Why does the calculator ask if I planted from seed or transplant?

A transplant already has several weeks of growth behind it, so it generally reaches harvest sooner than the same crop started from seed in the ground. Choosing the right method gives a more accurate estimate. For crops that are almost always direct sown, such as carrots, radishes, beans, corn, and peas, the two numbers are the same, so the choice does not change the result.

How accurate is the harvest date?

Treat it as a well-informed estimate rather than a guarantee. The harvest window is typically within about a week either side of the calculated date. Warm weather, long days, and rich soil can speed things up, while cool spells, drought, cloudy weather, and crowding can slow a crop down. Watching the plants themselves is always the final word on ripeness.

Why is garlic so far in the future?

Garlic has one of the longest seasons in the vegetable garden, around 240 days. It is planted from cloves in the fall, grows roots before winter, sits dormant in cold weather, then bulks up and is harvested the following summer. Because the season crosses into the next year, the calculator shows the year alongside the harvest date for garlic.

How do I know when a crop is actually ripe?

Use the date as a reminder to start checking, then judge by the crop. Tomatoes should be fully colored and slightly soft, beans should snap cleanly while the seeds are still small, and zucchini are best young at 6 to 8 inches. Root crops like carrots and beets can be nudged aside at the soil line to check their width before pulling the whole row.

Should I plant everything at once?

For quick crops like lettuce, radishes, spinach, and beans, sowing a small batch every couple of weeks gives you a steady supply instead of one big glut. This technique, called succession planting, spreads the harvest across the season. Longer-season crops like tomatoes, peppers, and onions are usually planted once for a single main harvest.

Does the countdown update over time?

Yes. The "days until harvest" figure is calculated from today's date each time you run the calculator, so it counts down as the season progresses. Once the estimated date has passed, the tool lets you know the crop should be ready to start checking for harvest.

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GardenCalc Editorial Team

Horticulture writers & master gardeners

Our calculators and growing guides are written and fact-checked by gardeners with hands-on experience in vegetable production, soil management, and home landscaping.