YepPlant

About YepPlant

Yep. Planted.

Vegetable planting calendars and frost dates, by ZIP. YepPlant finds the weather station nearest to your ZIP code and works out when to start seeds indoors, transplant, sow directly, and sow for a fall crop, at three levels of frost risk. You can print the year as a planting calendar or add it to your calendar app. No sign-up, no account.

YepPlant covers ZIP codes in the 48 contiguous states and Washington, DC. The states and vegetables it covers are listed on the home page.

The planner and the ZIP code field on each crop page work out your planting windows in your browser and don't send your ZIP code to a server. The Privacy Policy explains what's collected when you visit.

Where the data comes from

Frost dates come from NOAA's U.S. Climate Normals for 1991–2020: for each weather station, the last spring frost and the first fall frost at several temperature thresholds and chances. They're statistics from those years, not a forecast for this year, and frost in your garden can come earlier or later than at the station. ZIP codes are matched to stations through the Census Bureau's ZIP Code Tabulation Areas (ZCTAs).

Hardiness zones come from the 2023 USDA Plant Hardiness Zone Map, prepared by the PRISM Group at Oregon State University and released by the USDA Agricultural Research Service, and are shown in their own place. A zone is a guide to which perennials survive your winters, so the planting windows don't use it.

Crop rules, such as how many weeks before the last frost to start seeds indoors, come from university extension publications. Each crop's page names the source of every rule, and a rule without a source isn't shown. The Methods and Sources page explains how the windows are worked out and lists the version of each data source.

Who runs YepPlant

YepPlant is an independent site run by Masaaki Morishita. It's one of the Yep sites:

YepPlant isn't affiliated with NOAA, the USDA, the Census Bureau, or any university. To report a result that looks wrong or ask for a vegetable, email hello@yepplant.com or see Contact.