US Grow Zones

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.

US Grow Zones is listed with 2 APIs on the APIs.io network. Tagged areas include Agriculture, Weather, Plants, Geolocation, and Free.

The US Grow Zones catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

US Grow Zones’ developer surface includes documentation, API reference, getting-started guide, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.5/100 emerging Agent 16/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Agriculture Weather Plants Geolocation FreeAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 24.5/100 · emerging

Contract Quality 3.5 / 21

Developer Ergonomics 7.3 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

11 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 16.4 — up to +20.9 composite points
Access Clarity scores 10.5 — up to +17.9 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/usgrowzones-com/apis.yml: open an issue on github.com/api-evangelist/usgrowzones-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

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.

Pricing Plans 1

Published pricing tiers and plan structures.

Usgrowzones Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Usgrowzones Com Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Usgrowzones Com Context

1 classes · 2 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

US Grow Zones API Rules

9 rules · 7 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

GetDataZw10JsonResponse

2 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Usgrowzones Com Authentication

0 schemes

SECURITY

Usgrowzones Com Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Usgrowzones Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: usgrowzones-com
name: US Grow Zones
description: 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.
url: https://artifacts.apis.io/usgrowzones-com/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The developer portal documents the API but provides no machine‑readable OpenAPI or other spec.
  evidence:
  - url: https://usgrowzones.com/developers/
    status: 200
  checked: '2026-10-29'
tags:
- Agriculture
- Weather
- Plants
- Geolocation
- Free
- API
image: https://usgrowzones.com/assets/og/developers.png
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/usgrowzones-com-rules.yml
- type: JSONLD
  url: json-ld/usgrowzones-com-context.jsonld
- type: Vocabulary
  url: vocabulary/usgrowzones-com-vocabulary.yml
- type: DataModel
  url: data-model/usgrowzones-com-data-model.yml
- type: Conformance
  url: conformance/usgrowzones-com-conformance.yml
- type: Hosts
  url: hosts/usgrowzones-com-hosts.yml
- type: Vendors
  url: vendors/usgrowzones-com-vendors.yml
- type: DomainSecurity
  url: security/usgrowzones-com-domain-security.yml
- type: Website
  url: https://usgrowzones.com
- type: DeveloperPortal
  url: https://usgrowzones.com/developers/
- type: Documentation
  url: https://usgrowzones.com/developers/
- type: APIReference
  url: https://usgrowzones.com/developers/
- type: GettingStarted
  url: https://usgrowzones.com/developers/
- type: PrivacyPolicy
  url: https://usgrowzones.com/privacy/
- type: Support
  url: https://usgrowzones.com/contact/
apis:
- aid: usgrowzones-com:hardiness-api
  name: US Grow Zones Hardiness API
  description: Free JSON API for USDA plant hardiness zones, temperature ranges, and frost dates by U.S. ZIP code.
  humanURL: https://usgrowzones.com/developers/
  tags:
  - Agriculture
  - Weather
  - Plants
  - Geolocation
  - Free
  - API
  tags_raw:
  - agriculture
  - weather
  - plants
  - geolocation
  - free
  - api
  properties:
  - type: Documentation
    url: https://usgrowzones.com/developers/
  - type: APIReference
    url: https://usgrowzones.com/developers/
  - type: GettingStarted
    url: https://usgrowzones.com/developers/
- aid: usgrowzones-com:usgrowzones-com-api
  name: US Grow Zones API
  description: '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.'
  humanURL: https://usgrowzones.com/developers
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/usgrowzones-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/usgrowzones-com-get-data-zw10-json-response-schema.json
x-submission-notes: Keyless GET /api/v1/zip/{zip}; /developers
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

US Grow Zones API — frequently asked questions

Does US Grow Zones have an API?

Yes. APIs.io lists 2 APIs from US Grow Zones, including US Grow Zones Hardiness API and US Grow Zones API.

Is there an OpenAPI specification for the US Grow Zones API?

Yes. APIs.io indexes 1 OpenAPI specification for US Grow Zones, each linked for download from this page.

How do I authenticate with the US Grow Zones API?

US Grow Zones documents its authentication (0 schemes). The details are profiled on APIs.io as Usgrowzones Com Authentication.

Is the US Grow Zones API ready for AI agents?

US Grow Zones has a Kin Score of 24.5 out of 100 (emerging) and an Agent Readiness score of 15.5 (agent-aware), scored by API Evangelist on 2026-10-31.

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