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Tomato flowering check-in

We don't know when your tomatoes were planted, so we can't tell what stage they're at. Your answer lets us time tasks like picking before cold nights.

When we suggest this

  • Your noteYou haven't noted a planting date or a stage yet.
  • Climate averageThe date falls from 28 days after your typical last spring frost to 120 days after your typical last spring frost, based on 1991–2020 climate normals.

What would stop us suggesting it

  • When you note a new stage, or the timing window ends.
  • When you mark it Done or Doesn't apply. "Doesn't fit my setup" stops it for that plant this season.

What to do

  1. Look for small yellow flowers along the stems.
  2. Tap the answer that fits. We'll time the next tasks from there.

What we can't know

  • When this was planted. Add a date for better timing.

The window is an estimate, not a sourced date: tomatoes go out about 1–2 weeks after the typical last frost, reach first ripe fruit about 55–90 days after transplanting depending on variety, and fruit takes about 6–8 weeks from flower to ripe, so most plants flower within the first several weeks after planting. We start asking about 4 weeks after the typical last spring frost and stop about 17 weeks after.

Where this advice applies

All US regions.

Gardens with a typical last spring frost. The check-in starts about four weeks after that date.

Tomatoes are usually set out one to two weeks after the typical last spring frost.

Exceptions

  • Plants with a planting date. We time their tasks from the date instead.
  • Gardens with no typical freeze. There, tomato seasons vary too much to guess.

Related guide sections

Sources

  1. Cornell Garden-Based Learning (Cornell University). Tomato growing guide. Accessed September 25, 2026
  2. University of New Hampshire Extension. Growing Vegetables: Tomatoes [fact sheet]. Accessed September 25, 2026
  3. University of Minnesota Extension. How excessive heat affects the vegetable garden. Accessed September 25, 2026
  4. University of Minnesota Extension. Growing tomatoes in home gardens. Accessed September 25, 2026

Reviewed

Sources checked Sept 2026 · awaiting expert review

Gardenplanner research (AI-assisted), pending extension-qualified review

Rule id and version: tomato.stage-checkin@1