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How Are Planting Dates Calculated?

Planting Dates

Written by Shelby Rayne

Seedtime calculates planting dates using a combination of your location (growing zone), frost dates, and the specific growing requirements of each crop.

Every crop has its own recommended planting window. Seedtime uses this information to determine when you should start seeds, transplant seedlings, and direct sow based on your selected growing zone.

Factors Seedtime Uses

Frost Dates

Many crops are sensitive to frost. Seedtime uses your average last spring frost date and first fall frost date to determine safe planting times.

Crop Requirements

Each crop has unique growing needs. For example:

  • Peas can be planted before the last frost.

  • Tomatoes should typically be planted after the danger of frost has passed.

  • Garlic is often planted in the fall.

Days to Maturity

Seedtime also considers how long a crop typically takes to grow from planting to harvest. This helps ensure your crop has enough time to mature in your growing season.

Planting Method

Many crops can be grown using different planting methods. Depending on your preferences and growing conditions, you may choose to:

  • Direct sow seeds directly into the garden

  • Start seeds indoors and transplant them later

  • Purchase seedlings and transplant them into the garden

Seedtime calculates planting dates based on the planting method you've selected for each crop. Changing the planting method may result in different recommended planting dates and tasks.

Why Might My Dates Change?

Your planting dates may change if you:

  • Update your location or frost dates

  • Change crop varieties

  • Adjust growing settings

Are These Dates Exact?

Planting dates are recommendations based on average conditions and best practices. Weather, soil temperature, rainfall, and local growing conditions can all affect the ideal planting time.

Use Seedtime's dates as a guide, and adjust as needed based on your experience and current conditions.

Can I Plant Earlier or Later?

In many cases, yes. Experienced gardeners often adjust planting dates based on weather patterns, season extension methods, or personal preference.

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