About

Last Frost Date answers one question well: when does frost usually stop where you live, and how sure can you be? Type a ZIP code and you get your frost dates, how sure they are, your hardiness zone, and a planting calendar you can print.

Who runs it

Last Frost Date is an independent website run by one person. It isn't part of NOAA, the USDA, the Census Bureau or any university, and none of them reviews or endorses it. It uses their published data and guidance, and names them so you can check.

How the content is checked

• The numbers are computed, not typed. Every frost date, zone and calendar date on the site is worked out by a program from the published data files, and the same code produces the ZIP code lookups and the place pages, so the two always agree. We spot-check stations against NOAA's raw files.
• The guides name their sources. Each guide lists the extension publications and weather service pages it relies on, and shows the date its claims were last compared with them. Rebuilding the site doesn't change that date; re-checking does.
• We don't forecast. The dates describe 1991 to 2020. For the coming nights, your local forecast is the authority.

The How it works page explains every step, from NOAA's data to your planting calendar.

Corrections

If something here is wrong, a date, a zone, a station or a sentence in a guide, please email hello@lastfrostdate.com and say which page. We check it against the source, fix it if it's wrong, and update the page's checked date.

Advertising

The site is free to use and is paid for by advertising from Google AdSense. Ads never appear on the printable planners, and the ZIP code you type into the lookup is looked up inside your browser: our code never puts it in a web address or sends it in a request.

Affiliate links

This site has no affiliate links. If that changes, links to seed companies or garden suppliers that pay a commission will be labeled where they appear and explained here, and they will never change the frost dates, the calendar or what the guides say.

Questions about your own garden

For advice about your soil, your pests or what grows best near you, your county's Cooperative Extension office is the best place to ask. Most offer free help by phone or email, and many run Master Gardener programs.