USDA hardiness zone, frost dates and vegetable planting calendar for any U.S. ZIP code.
Connect Remote server
claude mcp add --transport http grow-zones https://usgrowzones.com/mcp
{
"mcpServers": {
"grow-zones": {
"url": "https://usgrowzones.com/mcp"
}
}
}
{
"servers": {
"grow-zones": {
"type": "http",
"url": "https://usgrowzones.com/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://usgrowzones.com/mcp
Tools 4 found in our last check
get_zone_by_zipUse 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.
get_frost_datesUse 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.
get_planting_calendarUse 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.
what_to_plant_nowUse 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.
Details
| Endpoint | https://usgrowzones.com/mcp (Streamable HTTP) |
| First published | 30 Oct 2026 |
| Last updated | 30 Oct 2026 |
| Registry name | com.usgrowzones/grow-zones |
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