Vegetable Planting Calendar Guide

What frost dates actually are

Two dates bracket your growing year. The last spring frost is the average date after which frost is unlikely; the first fall frost is the average date it returns. "Average" is doing real work here: technically it's the date with a 50% probability of no further frost, compiled from decades of weather records. In any given year, expect your actual dates to wander about ±2 weeks around the average — which is why experienced gardeners watch the forecast, not just the calendar.

Regional averages (Garden Design / Garden Betty / Almanac). Zones smooth over real local differences — see below.

How to find your dates

Zone averages get you in the right month; three sources get you the right week:

1. Old Farmer's Almanac frost-date lookup — enter your ZIP code for dates computed from nearby weather stations. The best free option for most US gardeners.
2. Your state cooperative extension — publishes county-level planting calendars tuned to local conditions. Search "[your state] extension vegetable planting calendar."
3. NOAA historical data — the raw records behind everything else, for data-minded gardeners.

Plug whatever you find into our planting calendar calculator — it accepts a custom last frost date that overrides the zone average.

Indoor start vs. direct sow vs. transplant

Three ways a seed becomes a plant, and the choice is mostly about roots and season length:

• Start indoors — tomatoes, peppers, broccoli, kale, onions. Gives long-season crops a head start under lights, 4–10 weeks before they go out.
• Direct sow — peas, beans, carrots, lettuce, corn. Taprooted crops (carrots) and fast growers hate transplanting; they go straight in the ground.
• Transplant out — the moment indoor seedlings move to the garden. Hardy transplants (broccoli, kale) go out 2–4 weeks before the last frost; tender ones (tomatoes, peppers) 1–2 weeks after.

Worked example: Zone 5

Average last frost ≈ April 18, first frost ≈ October 17 — about 182 frost-free days.

• Tomatoes: transplant ~April 29 (1.5 weeks after frost) → start indoors ~March 11 (7 weeks earlier).
• Peppers: transplant ~May 2 (2 weeks after) → start indoors ~February 28 (9 weeks earlier).
• Peas: direct sow ~March 14 (5 weeks before frost), as soon as soil can be worked.
• Lettuce: direct sow ~March 28, then again every 2–3 weeks (see succession below).
• Beans: direct sow ~April 22 at the earliest — soil must be above 60°F or seeds rot.

Succession planting: the continuous harvest

One sowing gives one glut. Succession planting staggers the same crop so harvests arrive in waves:

• Lettuce, radishes, spinach: sow a short row every 2–3 weeks from spring through early fall.
• Beans, corn: sow every 2 weeks until about 10 weeks before your first fall frost.
• Carrots, beets: one spring sowing plus one midsummer sowing for fall harvest.

When the first batch is harvested, the bed is already empty for the next — the same square footage feeds you three times over.

Don't forget the fall garden

The calendar works in reverse, too. Take your first fall frost, subtract the crop's days to maturity (on the seed packet), then subtract ~2 extra weeks because fall growth is slower than spring. Example for Zone 5 (first frost ~Oct 17): kale at 55 days → Oct 17 − 55 days − 14 days ≈ August 9 last safe sowing. Kale, spinach, carrots and garlic are the classic fall crops — kale even tastes better after a light frost.

Three mistakes everyone makes once

• Starting tomatoes too early. Leggy, pale seedlings under weak indoor light never catch up. Count backward properly — 6–8 weeks, not 12.
• Sowing beans in cold soil. Below ~60°F they rot instead of sprouting. Patience here is a yield strategy.
• Ignoring soil temperature. Air frost dates are half the story. A $10 soil thermometer tells you when the ground is actually ready — peppers and cucumbers want 65°F+.

Reading a seed packet like a calendar

That little packet is a condensed planting calendar — once you know the vocabulary:

• "Days to maturity" counts from transplanting (or from germination for direct-sown crops) to first harvest. Use it for fall planning math.
• "Sow after last frost" means exactly that — not on it. "Sow 4–6 weeks before last frost" is your cue to count backward.
• Soil temperature notes ("germinates at 60–85°F") override calendar dates in a weird spring — trust the thermometer.
• "Sow ¼ inch deep, thin to 6 inches" — depth and spacing. Pair with our seed spacing calculator so you buy the right number of packets.

Keep a one-page garden journal each season: what you sowed, when, and what actually happened. After two years you'll have a planting calendar no website can beat — one calibrated to your yard.