USDA hardiness zone, frost dates and vegetable planting calendar for any U.S. ZIP code.
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Use this when the user asks for the average last spring frost, first fall frost, or growing season length for a U.S. ZIP code (or a city + state). Returns NOAA 1991-2020 frost dates (10/30/50% probability) and a source link to cite.
5-digit U.S. ZIP code, e.g. 30301
City name (optional, instead of zip)
2-letter state code, with city
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http grow-zones https://usgrowzones.com/mcp
Use this when the user asks for the average last spring frost, first fall frost, or growing season length for a U.S. ZIP code (or a city + state). Returns NOAA 1991-2020 frost dates (10/30/50% probability) and a source link to cite.
| Argument | Type | Description |
|---|---|---|
| zip | string | 5-digit U.S. ZIP code, e.g. 30301 |
| city | string | City name (optional, instead of zip) |
| state | string | 2-letter state code, with city |
{
"type": "object",
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}$",
"description": "5-digit U.S. ZIP code, e.g. 30301"
},
"city": {
"type": "string",
"description": "City name (optional, instead of zip)"
},
"state": {
"type": "string",
"description": "2-letter state code, with city"
}
},
"additionalProperties": false
}Use this when the user asks when to start seeds indoors, transplant, direct sow or plant a fall crop for vegetables at a U.S. ZIP code. Optionally pass one crop; otherwise returns all supported crops. Includes a source link to cite.
| Argument | Type | Description |
|---|---|---|
| zip* | string | 5-digit U.S. ZIP code, e.g. 30301 |
| crop | string | Optional crop slug |
{
"type": "object",
"required": [
"zip"
],
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}$",
"description": "5-digit U.S. ZIP code, e.g. 30301"
},
"crop": {
"enum": [
"tomato",
"pepper",
"lettuce",
"green-beans",
"sweet-corn",
"zucchini",
"cucumber",
"carrot",
"onion",
"potato",
"basil",
"spinach",
"kale",
"broccoli",
"peas",
"eggplant",
"cabbage",
"radish",
"strawberry",
"beets",
"garlic"
],
"type": "string",
"description": "Optional crop slug"
}
},
"additionalProperties": false
}Use this when the user asks what USDA plant hardiness zone (e.g. 7a) a U.S. ZIP code is in, or the average extreme winter low there. Returns the 2023 USDA zone, temperature range and a source link to cite.
| Argument | Type | Description |
|---|---|---|
| zip* | string | 5-digit U.S. ZIP code, e.g. 30301 |
{
"type": "object",
"required": [
"zip"
],
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}$",
"description": "5-digit U.S. ZIP code, e.g. 30301"
}
},
"additionalProperties": false
}Use this when the user asks what vegetables they can plant or start now (or on a given date) at a U.S. ZIP code. Returns crops whose planting window is open, plus what opens in the next 30 days, and a source link to cite.
| Argument | Type | Description |
|---|---|---|
| zip* | string | 5-digit U.S. ZIP code, e.g. 30301 |
| date | string | Optional date YYYY-MM-DD (default: today, UTC) |
{
"type": "object",
"required": [
"zip"
],
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}$",
"description": "5-digit U.S. ZIP code, e.g. 30301"
},
"date": {
"type": "string",
"description": "Optional date YYYY-MM-DD (default: today, UTC)"
}
},
"additionalProperties": false
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Oct 30, 2026.