Developer Tools

Two ways to bring frost dates, USDA growing zones, and climate data to your website or app.

Embeddable Widget

No coding required

Drop a ready-made frost date lookup onto any website with just two lines of HTML. Your visitors can search any location worldwide for frost dates, USDA zones, and a frost risk timeline — all without leaving your site.

Free tier — 2 lookups per visitor per day
Light and dark themes
Works on any site, CMS, or page builder
Open source

Widget Documentation

REST API

Full control

Build your own integration with a simple REST API. Query any location worldwide — from major cities to rural villages — for frost dates, USDA hardiness zones, and average temperatures. International coverage powered by the same data as frostdates.com.

Free tier — 10 test locations with unlimited calls, no credit card
JSON responses, API key authentication
Frost dates, USDA zones, and temperature data
Location search endpoint

API Documentation

Frost Dates

First and last frost dates for any location worldwide. Air frost, light ground frost, and hard ground frost.

USDA Zones

Hardiness growing zones calculated from historical climate data. Covers all global locations.

Location Search

Search for locations by name. Returns coordinates, country, and region data for any location worldwide.

Getting Started

Sign up — Create a free developer account with just your email.
Choose your integration — Use the embeddable widget for a no-code solution, or the REST API for full control. Both cover locations worldwide.
Try it free — The widget includes 2 free lookups per visitor. The API offers 10 test locations with unlimited calls at no cost.
Subscribe — Choose a paid plan when you're ready to unlock unlimited locations.

API Pricing

Paid plans unlock unlimited worldwide locations for both the widget and the REST API. The widget is free with branding for up to 2 lookups per visitor.

Starter

$19/month

500 requests/day
10,000 requests/month
30/min rate limit
Both endpoints included
Unlimited test locations

Get Started

Pro

$49/month

3,000 requests/day
60,000 requests/month
120/min rate limit
Both endpoints included
Unlimited test locations

Get Started

Business

$99/month

10,000 requests/day
200,000 requests/month
300/min rate limit
Both endpoints included
Unlimited test locations

Get Started

Get Started Free

No credit card required.