# US Grow Zones

**Canonical:** https://apis.io/providers/usgrowzones-com/  
**Website:** https://usgrowzones.com  
**APIs profiled:** 2

US Grow Zones provides a free, keyless JSON API that returns USDA plant hardiness zones, temperature ranges, and frost dates for any U.S. ZIP code. The service also offers a web interface to look up zones, first and last frost dates, and planting calendars for over 500 U.S. cities. No authentication is required and CORS is open, making it suitable for apps, blogs, and research.

## Kin Score — 24.5 / 100 (emerging)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 57.1 |
| Contract Quality | 16.4 |
| Contract Governance | 22.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 42.9 |
| Access Clarity | 10.5 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 24.5 (matched via fallback).

## Agent readiness — 15.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |

## APIs (2)

- **US Grow Zones Hardiness API** — Free JSON API for USDA plant hardiness zones, temperature ranges, and frost dates by U.S. ZIP code.
- **US Grow Zones API** — US Grow Zones API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist (2026-10-29); not the provider's own document.

## Security (2)

- **Usgrowzones Com Authentication** — 0 schemes
- **Usgrowzones Com Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Usgrowzones Com Plans Pricing**

## Tags

Agriculture, Weather, Plants, Geolocation, Free, API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/usgrowzones-com/). Scores are computed from the provider's own public artifacts under a published rubric.