When to plant tomato in Baltimore
Published guidance for the region shown below. Dates retain the source's precision and are not a weather forecast or a guarantee for an individual garden.
Tomato: Start seeds indoors: March week 3–May week 3; Transplant outdoors: May week 1–July week 1; Published harvest period: July week 1–October week 4
Regional calendar used as a reference for Baltimore; not a garden-specific forecast.
Vegetable Planting Calendar for Central Maryland · University of Maryland Extension · October 2021
PDF page 3, Tomatoes row; color legend on page 1 · Source checked 2026-09-13
The source uses four numbered week columns per month and a May 1 / October 31 frost baseline. Published harvest bands cover early through late plantings; a single planting does not yield throughout the whole band.
How to use this guidance
Where does the tomato guidance for Baltimore come from?
The published recommendations are from University of Maryland Extension (Central Maryland). Check the geographic scope and conditions beside each citation.
Are these exact dates for my garden?
No. These are regional recommendations at the precision used by the source. Weather, elevation, cultivar and growing conditions still matter. A missing window means we have not verified a source, not that growing is impossible.
Which planting and harvest periods are published?
Start seeds indoors: March week 3–May week 3. University of Maryland Extension; Central Maryland. Transplant outdoors: May week 1–July week 1. University of Maryland Extension; Central Maryland. Published harvest period: July week 1–October week 4. University of Maryland Extension; Central Maryland.