Vegetable Garden Planting Calendar

Vegetable Planting Calendar — guide & how to use

What it does

"Plant in spring" is useless advice — the right seed-starting, transplant, direct-sow, and harvest dates depend entirely on your local frost dates, and getting them wrong kills the crop or wastes the season. This tool turns two dates — your average last spring frost and first fall frost — into a personalized, color-coded, printable calendar for each vegetable you pick. Every date is computed as an offset from your frost dates, the same way the Old Farmer's Almanac and Cooperative Extension calendars do it.

How to use it

1. Enter your last spring frost and first fall frost dates. Don't know them? Look them up by ZIP at almanac.com (NOAA station data) or ask your extension office.
2. Pick your planning season: Spring (counts forward), Fall (counts backward from first frost), or Both.
3. Check off the crops you want. The eight most-grown vegetables are pre-selected.
4. Optional: open Days-to-maturity overrides and type the number from your seed packet for any crop.
5. Read your calendar and the "what to do now" buckets, then Copy result or grab a share link that reloads everything.

Worked example

Say your average last spring frost is April 15 and your first fall frost is October 15 (roughly USDA zone 6), and you pick tomato for the Spring season. Tomato starts indoors 6 weeks before the last frost — that's March 4. It transplants outdoors about 1.5 weeks after the last frost once soil warms — roughly April 26–May 3. With a 75-day maturity counted from the transplant date, the estimated first harvest is around July 10. A direct-sown crop like bush bean shows no indoor-start date — it's sown outdoors about a week after the last frost (≈ April 22) for a harvest near June 16. Switch to Fall and the same beans count backward from October 15: 55 days to maturity plus a 14-day slow-growth buffer means sow by about August 7 to finish before frost.

How the math works (and its limits)

• Spring counts forward. Start indoors = last frost − (weeks indoors). Transplant = last frost + transplant offset (1–2 weeks for tender crops). Direct-sow = last frost ± the crop's cold tolerance. Harvest = the planting/transplant date + days-to-maturity.
• Transplanted-crop maturity is counted from the transplant date, not from seed-sowing — that's the seed-industry convention, so spring harvest estimates follow it.
• Fall counts backward. Plant/sow-by = first frost − (days-to-maturity + 14-day buffer). The buffer accounts for slower autumn growth; some sources instead use days-to-maturity × 0.75.
• Direct-sow-only crops (beans, squash/zucchini, cucumber, carrot, corn) never get an indoor-start date — they transplant poorly.
• Frost-tolerance. Tender crops must be harvested before the first fall frost; hardy crops (broccoli, carrot, lettuce) tolerate light frost and are flagged accordingly.
• Real calendar math. Offsets use true date arithmetic (leap years, month ends), so a 6-week count back from April 15 lands on the correct day.
• Averages, not guarantees. Average last-frost means frost has historically occurred after it about 50% of years. Watch the forecast before transplanting anything tender.
• No soil-temperature check. These are calendar dates, not a soil thermometer. Warm-season direct-sown seeds (beans, squash, cucumber) want soil around 60°F+ to germinate; peppers want warm soil too.

Common mistakes this tool helps you avoid

• Treating "start 6 weeks before last frost" as "plant outside on the last frost date" — tender crops go out 1–2 weeks after.
• Counting transplanted-crop maturity from the sow date instead of the transplant date (off by weeks).
• Forgetting the fall slow-growth buffer, so the crop never finishes before frost.
• Starting seeds indoors too early and ending up with leggy, root-bound seedlings.
• Direct-sowing beans/squash/cucumber into cold, wet soil where seeds rot.
• Assuming one national "spring" date works — local frost dates are the whole point.

Accuracy & sources

Built-in offsets and days-to-maturity follow the Old Farmer's Almanac seed-starting guidance, Johnny's Selected Seeds' planting calculator, and university extension calendars (University of Maryland, UNH). The 14-day fall buffer follows the Garden Professors' days-to-maturity discussion. This tool is not a substitute for region-specific Cooperative Extension calendars or your seed-packet instructions.

Disclaimer: Estimates for planning only. Verify your local frost dates and consult your regional extension office or seed-packet instructions before planting.

How to embed this tool on your website

No account, no coding. Copy the embed code and paste it where you want it to appear:

<iframe src="https://snaptoolsuite.com/vegetable-planting-calendar/?embed=1"
  style="width:100%;max-width:720px;height:1500px;border:0;"
  title="Vegetable Garden Planting Calendar" loading="lazy"></iframe>
<p>Free <a href="https://snaptoolsuite.com/vegetable-planting-calendar/">Vegetable Planting Calendar</a> by Snap Tool Suite</p>

See it live: view a real embed example →

Frequently asked questions

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