A vegetable garden planting calendar shows exactly when to start seeds indoors, transplant seedlings, direct sow, and expect your harvest — all based on your USDA hardiness zone. Instead of guessing or memorizing dates, select your zone below and get a color-coded visual schedule for 20+ vegetables, from tomatoes and peppers to radishes and herbs.
Select Your USDA Zone & Filter
Find your zone at planthardiness.ars.usda.gov
Select your USDA zone above to see your planting calendar
How to Use the Vegetable Garden Planting Calendar
A garden planting calendar takes the guesswork out of timing your vegetable garden. Every crop has a preferred planting window — plant too early and seedlings may freeze or stall in cold soil; plant too late and warm-season crops run out of time to mature before fall frost arrives. This tool generates a visual calendar for your specific USDA hardiness zone so you can see the full season at a glance.
Step 1: Find and Select Your USDA Zone
The USDA Plant Hardiness Zone Map divides North America into zones 3 through 13 based on average minimum winter temperatures. To find your zone, visit planthardiness.ars.usda.gov and enter your zip code. Most of the continental United States falls between zones 4 and 9. Select your zone from the dropdown and the calendar will immediately populate with planting windows calibrated for your climate.
Step 2: Read the Color-Coded Calendar Bars
Each vegetable row shows up to four colored bars spanning the calendar months. A blue bar indicates the window for starting seeds indoors. A green bar shows when to transplant seedlings outdoors (after the last frost risk has passed). An orange bar marks the window for direct sowing seeds into garden soil. A red bar shows the expected harvest period. The current month is highlighted in yellow so you can immediately see what is due right now.
Step 3: Filter by Season or Vegetable
Use the search field to quickly find a specific vegetable — type "tom" to jump to Tomatoes, or "herb" to see the herb entries. Use the Cool/Warm season filter buttons to focus on the crops that suit your current season. Cool-season vegetables like lettuce, spinach, and peas thrive in temperatures of 45–70°F and tolerate light frost. Warm-season vegetables like tomatoes, peppers, and cucumbers need temperatures above 60°F and cannot survive frost.
Step 4: Click a Row for Detailed Information
Click any vegetable row to expand a detail panel showing start indoors dates, outdoor planting dates, expected harvest window, days to maturity range, and growing notes. This helps you plan succession plantings — for example, sowing a second batch of lettuce 3 weeks after the first to extend your harvest across multiple months.
Understanding Planting Windows by Zone
Gardeners in colder zones like Zone 3 (northern Minnesota, Maine) have a short growing season running roughly from late May to early September — about 90 to 120 frost-free days. Warm-season crops must be started indoors well in advance and planted out only after Memorial Day. Zone 9 and 10 gardeners in southern California, Florida, and the Gulf Coast can grow many vegetables year-round, starting cool-season crops in fall and winter when northern gardeners are dormant. Use the planting calendar to understand these regional differences and plan accordingly.
Tips for Garden Planning Success
Keep a simple garden journal and record your actual planting dates, germination times, and harvest dates each year. This lets you refine the generic zone averages with data from your specific microclimate — a south-facing slope can behave like a zone warmer than your official zone number. Always check your local weather forecast before transplanting tender seedlings outdoors, and harden off transplants over 7–10 days by gradually exposing them to outdoor conditions before planting in the ground.
Frequently Asked Questions
Is this planting calendar free to use?
Yes, the garden planting calendar is completely free with no limits or signup required. Select your USDA hardiness zone and instantly see planting windows for all 20+ vegetables. All data runs locally in your browser.
Is my data private when I use this tool?
Absolutely. Everything runs locally in your browser using client-side JavaScript. No zone selection, search terms, or personal data are ever sent to a server. Your gardening information stays completely private on your device.
How do I find my USDA hardiness zone?
You can find your USDA plant hardiness zone by visiting the official USDA Plant Hardiness Zone Map at planthardiness.ars.usda.gov and entering your zip code. Zones range from 1 (coldest) to 13 (hottest). Most of the continental US falls in zones 3 through 10.
What is the difference between starting indoors and direct sowing?
Starting indoors means planting seeds in containers inside your home weeks before the outdoor season, then transplanting seedlings outside later. Direct sowing means planting seeds directly into garden soil. Warm-season crops like tomatoes need indoor starts to get a head start; root crops like carrots are always direct sown because transplanting disturbs their roots.
What do cool-season and warm-season vegetables mean?
Cool-season vegetables like lettuce, spinach, and peas thrive in temperatures of 45–70°F and can tolerate light frost. They are planted early in spring and again in fall. Warm-season vegetables like tomatoes, peppers, and cucumbers need temperatures above 60°F and must be planted after all frost risk has passed.
Can I use this calendar for fall planting?
Yes. Many cool-season vegetables like kale, spinach, broccoli, and carrots can be planted in late summer for a fall harvest. The planting windows shown account for the full growing season. Count backwards from your first fall frost date to determine the latest you can sow cool-season crops for fall.
Why are planting dates different for different USDA zones?
USDA hardiness zones are based on average minimum winter temperatures and correspond to distinct climate patterns. Gardeners in Zone 3 (Minnesota, Maine) have a short growing season with a last frost in May. Gardeners in Zone 9 (Southern California, Gulf Coast) may garden year-round. Planting windows shift accordingly — warmer zones start earlier and have longer growing seasons.
What does 'days to maturity' mean for vegetables?
Days to maturity is the number of days from transplanting (or from direct sowing) until the vegetable is ready to harvest. For example, a tomato with 75 days to maturity planted outdoors on May 15 should be ready around August 1. This number varies by variety, so check your seed packet for the exact figure for your chosen cultivar.