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API · /hardiness-api

Plant Hardiness API

healthy 3,779 Subscribers

Work with USDA Plant Hardiness Zones: determine the hardiness zone for any location from its average annual extreme minimum temperature in Celsius or Fahrenheit (returning the zone code such as 6b, the zone number, subzone and the temperature range in both units), browse the complete reference of all 26 subzones from 1a to 13b with their temperature ranges and example regions worldwide, look up a single subzone by code, and find which common garden plants — fruits, vegetables, herbs, shrubs, trees, perennials, vines, bulbs, succulents and grasses — tolerate a given zone. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side computation (no third-party upstream), so responses are instant and always available. Ideal for gardening and plant-finder apps, AgTech and landscaping tools, nurseries and education.

#hardiness #usda #gardening #plants #agriculture #horticulture #data
api.oanor.com/hardiness-api
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Machine-readable spec so AI agents can integrate this API.

/api/hardiness-api/openapi.json
/api/hardiness-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
70 ms
Server probes · 24h
Subscribers
3,779
active
Total calls
36
last 7 days
status Full status page → · 36 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 13,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 13,000 calls/month, 3 req/s
  • Zone from temperature, zone reference & plant suitability
  • No credit card
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Basic

€5.80 /month

  • 160,000 calls / month
  • 9 requests / second
  • Hard cap (429 above quota, no overage)
  • 160,000 requests/month, 9 req/s
  • All endpoints, full zone reference & plant matching
  • Commercial use included
  • Email support
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Pro

€16.50 /month

  • 1,200,000 calls / month
  • 22 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,200,000 requests/month, 22 req/s
  • High throughput for gardening & plant-finder apps
  • Priority email support
  • Commercial use allowed
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Mega

€42.00 /month

  • 5,500,000 calls / month
  • 55 requests / second
  • Hard cap (429 above quota, no overage)
  • 5,500,000 requests/month, 55 req/s
  • Highest throughput for production AgTech & widgets
  • Priority support
  • Commercial use allowed
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Plant Hardiness API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Plant Hardiness API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Plant Hardiness API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Plant Hardiness API cost?
Plant Hardiness API has a free tier with 100 calls / month. Paid plans start at €5.80 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Plant Hardiness API GDPR-compliant?
All requests to Plant Hardiness API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/hardiness-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/hardiness-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/hardiness-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/hardiness-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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