# Garden Calculators – Frost Risk

> Garden Calculators – Frost Risk is a paid API for AI agents from garden-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Returns the freeze class of a forecast overnight low against plant hardiness, and indicates where a given date falls relative to average frost dates.

## Facts

- Endpoint: GET https://garden-calc.x402tookit.com/frost-risk?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/garden-calculators-frost-risk-2040665c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_61RnUcUu3xbka3VVMnx6w

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability garden-calculators-frost-risk-2040665c
```

Example prompt: Tonight's forecast low is 29°F — will that hurt my tender tomato seedlings, and is today (May 5) before or after my average last frost date of May 10?

## When to prefer this

Use this endpoint when you need to classify a specific forecast overnight low against a plant's cold tolerance and/or determine where a given calendar date sits relative to a gardener's local average frost dates. It is purpose-built for home gardeners and gardening agents needing actionable freeze-risk verdicts, damage thresholds, and calendar-aware planting guidance — rather than a generic weather or almanac lookup.

## Known failure modes

- Missing required lowTemp parameter returns a validation error
- Invalid date format (not YYYY-MM-DD) causes a parsing error
- Unknown hardiness value outside allowed enum may be ignored or cause an error
- Very extreme temperatures (e.g. >120°F or <-60°F) may return degraded:true
- If frost dates are omitted, spring/fall calendar position fields return null

## How this service works

Frost or freeze class of a forecast low against plant hardiness, plus where a date sits against your average frost dates.

## Output

Returns a freeze class (e.g. light freeze, hard freeze), the freeze band temperature range, whether the low is below the plant's damage threshold, the typical damage threshold in °F, protection advice, a plain-language verdict and summary, reasons explaining the assessment, and — when frost dates and a date are supplied — the spring calendar position and how many days the date is before or after the average last frost.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "lowTemp"
     ],
     "properties": {
      "date": {
       "type": "string",
       "description": "The date as YYYY-MM-DD, for the calendar position"
      },
      "unit": {
       "type": "string",
       "description": "f (default) or c"
      },
      "lowTemp": {
       "type": "number",
       "description": "Forecast overnight low"
      },
      "hardiness": {
       "type": "string",
       "description": "tender (default), half-hardy or hardy: how well the plant takes cold"
      },
      "averageLastFrost": {
       "type": "string",
       "description": "Your average last spring frost date, YYYY-MM-DD (any year; month and day matter)"
      },
      "averageFirstFrost": {
       "type": "string",
       "description": "Your average first fall frost date, YYYY-MM-DD"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "lowC": {
       "type": [
        "null",
        "number"
       ]
      },
      "lowF": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "hardiness": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "freezeBand": {
       "type": [
        "null",
        "string"
       ]
      }
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/garden-calculators-frost-risk-2040665c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from garden-calc.x402tookit.com](https://www.zero.xyz/host/garden-calc.x402tookit.com/llms.txt)