Here’s a confession: my first garden was a disaster because I planted everything on the same weekend in May. Tomatoes, lettuce, peas, broccoli, peppers, beans — all went into the ground the same Saturday afternoon because I assumed “spring = planting time” and that was the end of the thinking.

Half of it failed. The lettuce bolted within weeks because it was already too warm. The peas barely produced because they needed cooler temperatures that had already passed. The peppers sat stunned in soil that was still too cold for their roots. Meanwhile, the broccoli — which I could have planted six weeks earlier — finally produced tiny heads in July’s scorching heat, then immediately flowered and became inedible.

The lesson was painful but simple: different vegetables need different timing, and getting it right is the single biggest factor in garden success. A perfectly timed planting in mediocre soil will outperform a badly timed planting in the best soil on earth. Timing is that powerful.

This guide is the calendar I wish I’d had that first year. It’s organized around the one number that controls everything in your garden: your last spring frost date.

Find Your Frost Dates First

Every planting date in this guide — and in gardening generally — is calculated relative to two dates: your last spring frost (the final date temperatures dip below 32°F/0°C in spring) and your first fall frost (the first date they do so in autumn). The gap between them is your frost-free growing season.

Search “last frost date” plus your zip code or city to find your local dates. The USDA plant hardiness zone map and your local cooperative extension office are the most reliable sources. These are averages — actual frost dates vary year to year — but they provide the framework every planting decision builds on.

Cool-Season vs. Warm-Season: The Fundamental Split

Every vegetable falls into one of two categories, and confusing them is the fastest way to waste a season:

Cool-season crops COOL thrive in temperatures between 40-75°F. They tolerate light frost, actually taste better after a cold snap (frost converts starches to sugars in kale and carrots), and bolt (go to seed and become bitter) when temperatures consistently exceed 80°F. Plant these before your last frost in spring and after peak heat for fall harvests. Includes: lettuce, spinach, peas, broccoli, cabbage, kale, carrots, radishes, beets, cauliflower, Brussels sprouts, turnips.

Warm-season crops WARM need temperatures between 65-95°F. Even a light frost kills them instantly. They won’t grow (or will grow painfully slowly) in soil below 60°F. Plant these after all frost danger has passed and soil has warmed. Includes: tomatoes, peppers, eggplant, squash, cucumbers, beans, corn, melons, sweet potatoes, okra.

The Master Planting Calendar

This table shows when to start seeds indoors, when to direct sow outdoors, and when to transplant — all relative to your last spring frost date. “BF” means “Before Frost” (plant this many weeks before your last frost). “AF” means “After Frost” (plant this many weeks after).

Month-by-Month Garden Tasks

Timing adjusted for Zones 5-7 (the most common US growing zones). Shift earlier for Zones 8-9, later for Zones 3-4.

Succession Planting: Continuous Harvests All Season

Here’s the strategy that separates productive gardens from average ones: instead of planting all your lettuce at once (and harvesting it all at once, then having none for the rest of summer), plant a small amount every 2-3 weeks. This ensures a continuous supply rather than a feast-or-famine cycle.

The Fall Garden: Your Second Season

Most gardening guides focus entirely on spring planting and ignore the fall garden. This is a massive missed opportunity. In Zones 5-9, fall growing conditions are actually better than spring for many cool-season crops: gradually cooling temperatures (instead of rapidly warming ones that cause bolting), fewer pests, less disease pressure, and the sweetening effect of light frost on brassicas and root vegetables.

The key calculation: count backward from your first fall frost date. For each crop, add its days-to-harvest plus 14 days (to account for shorter, cooler fall days slowing growth). That gives you your latest planting date.

Example: First frost October 15. Broccoli takes 70 days. 70 + 14 = 84 days. Count back 84 days from October 15 = July 23. Start broccoli seeds indoors by July 1 for transplanting around August 1.

The fall garden is a second chance at everything the spring heat cut short: perfect lettuce, sweet carrots, beautiful broccoli, and kale that actually tastes good (frost-sweetened kale is a completely different vegetable from summer kale).

Zone-by-Zone Frost Date Reference

5 Timing Mistakes That Ruin Gardens

Frequently Asked Questions