What is 'hardening off'?

Hardening off is the process of gradually acclimating seedlings grown indoors to outdoor conditions (sunlight, wind, temperature changes). It typically takes 7-14 days and is crucial to prevent transplant shock.

Where can I find the indoor growing time for my seedlings?

This information is almost always on the seed packet. It's usually listed as 'start indoors X weeks before last frost'.

Is the transplant date the same as the last frost date?

Yes, this calculator sets the target transplant date to be your average last frost date, which is a safe time for most tender plants. For hardier plants, you could transplant a week or two earlier.

Transplanting Calculator

Determine the best time to move seedlings.

Frequently Asked Questions

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