How Planting Windows Work
Good planting timing is relative to your frost dates, not to a fixed calendar. The "right time" to sow a tomato or set out lettuce is defined as a number of weeks before or after your last spring frost — so two gardeners on the same date, one in Texas and one in Minnesota, have a completely different "right now." A date that's perfect in one ZIP can be six weeks early or late in another.
This tool resolves that for you. It takes today's date, looks up your ZIP's last spring frost and first fall frost from NOAA's 1991–2020 Climate Normals, and measures each crop's sowing windows against them. The result is a short, location-specific list that changes as the season moves. If you don't know your frost dates yet, the frost date and zone finder looks them up in one step.
Cool-Season vs Warm-Season Crops
Vegetables fall into two broad camps, and the difference drives almost all of the timing. Cool-season crops — lettuce, spinach, peas, and the brassicas like broccoli, kale, and cabbage — tolerate light frost and actually prefer cool weather, so they go in early in spring and again for a fall harvest. Warm-season crops — tomatoes, peppers, cucumbers, squash, and beans — are killed by frost and need warm soil and warm nights to grow, so they wait until well after the last frost.
That split is why the results carry a Cool Season / Warm Season filter. Early in the year the list is dominated by cool-season sowings; as the soil warms, the warm-season crops take over. Filtering lets you focus on whichever group you're planning for.
Starting Seeds Indoors
Many crops get a head start indoors before being moved outside. Starting four to eight weeks ahead of your last frost lets slow growers like tomatoes, peppers, and onions reach transplanting size exactly when the weather is ready for them — effectively stretching a short season. The seed starting calculator turns your frost date into a precise indoor-sowing date for each crop, and this tool flags those windows as they open.
Frequently Asked Questions
How does Gardenable know what to plant now?
It cross-references today's date with your ZIP's last spring and first fall frost dates, then checks each crop's timing windows from our verified crop database. Anything whose start-indoors, direct-sow, or transplant window is open — or about to open — is surfaced for your location.
Why does the list change every week?
Planting windows are tied to your frost dates, not the calendar. As the season progresses, different crops move into and out of their optimal sowing windows, so the recommendations shift week to week. That's why it's worth checking back regularly.
What if my ZIP isn't found?
Try a nearby ZIP. The tool uses NOAA weather station data, and a small number of ZIPs may not map directly to a station yet. A neighboring ZIP in the same area will give effectively the same frost dates.
Does this account for fall planting?
Yes. Fall sowing windows — sowing cool-season crops a set number of weeks before your first fall frost — are shown automatically when they become relevant, so the tool is useful in late summer and autumn, not just spring.