# Saylor Innovations Garden Plant Planting Window Calculator

> Saylor Innovations Garden Plant Planting Window Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Calculates optimal indoor start, transplant, and harvest dates for garden crops based on local frost dates and crop maturity

## Facts

- Endpoint: GET https://saylorinnovations.com/api/gardening/planting-window?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-garden-plant-planting-window-calculator-c4b0c0d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6qXsL1-uOBhCrET8wpQcQ

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 saylor-innovations-garden-plant-planting-window-calculator-c4b0c0d1
```

Example prompt: My last spring frost is April 15 and first fall frost is October 10 — when should I start tomatoes indoors if they take 75 days to maturity and need to be started 6 weeks before transplanting?

## When to prefer this

Use this endpoint when you need a quick, date-arithmetic-based planting schedule derived from frost dates and crop maturity — ideal for garden planning agents, seed-starting reminders, or growing zone tools. Prefer this over generic date calculators because it understands gardening-specific concepts like indoor start windows, transplant timing, and frost-free season length.

## Known failure modes

- Missing required parameters (last_frost, first_frost, days_to_maturity) returns an error
- Invalid date format (not YYYY-MM-DD) causes parsing failure
- Crop maturity days longer than frost-free window may produce a harvest date after first frost or an infeasible result
- Negative or non-numeric values for day counts cause validation errors
- first_frost date earlier than last_frost date may produce nonsensical results

## How this service works

Planting window dates from local frost dates and crop maturity - indoor start, transplant and harvest

## Output

Returns a JSON object with the recommended outdoor start date, recommended indoor start date (if applicable), estimated harvest date, number of frost-free days, days to maturity, the formula used, and a scope note clarifying what the calculation covers and excludes.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "last_frost",
      "first_frost",
      "days_to_maturity"
     ],
     "properties": {
      "last_frost": {
       "type": "string",
       "description": "required local last spring frost date YYYY-MM-DD (query)"
      },
      "first_frost": {
       "type": "string",
       "description": "required local first fall frost date YYYY-MM-DD (query)"
      },
      "after_frost_days": {
       "type": "string",
       "description": "optional non-negative buffer after last frost, default 0 (query)"
      },
      "days_to_maturity": {
       "type": "string",
       "description": "required non-negative crop maturity days (query)"
      },
      "indoor_start_days": {
       "type": "string",
       "description": "optional non-negative days to start indoors before outdoor date, default 0 (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "recommended_outdoor_start",
      "estimated_harvest_date",
      "scope_note"
     ],
     "properties": {
      "formula": {
       "type": "string",
       "description": "Formula used for the calculation"
      },
      "last_frost": {
       "type": [
        "string",
        "null"
       ],
       "description": "Last frost"
      },
      "scope_note": {
       "type": "string",
       "description": "What this data covers and what it leaves out"
      },
      "first_frost": {
       "type": [
        "string",
        "null"
       ],
       "description": "First frost"
      },
      "frost_free_days": {
       "type": "number",
       "description": "Frost free days"
      },
      "last_frost_date": {
       "type": "string",
       "description": "Last frost date"
      },
      "days_to_maturity": {
       "type": "number",
       "description": "Days to maturity"
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-garden-plant-planting-window-calculator-c4b0c0d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)