Skip to content
US Grow Zones logo

US Grow Zones MCP server

Which MCP servers are US Grow Zones's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-30

← Back to US Grow Zones

Whose server it is
  • Registry namecom.usgrowzones/grow-zonesverified in the MCP registry

The registry name sits under usgrowzones.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-30
  • Stateanswerschecked 2026-10-30
  • Tools4
  • Server calls itselfusgrowzones
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-30 the server answered initialize and tools/list without a sign-in. First answer in 161 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: look up a hardiness zone from a zip code; find average first and last frost dates for a city; compare planting calendars for crops like tomatoes and kale.
  • Checked on 3 of the 7 days it takes to judge reliability.

Once connected

  • For "look up a hardiness zone from a zip code", the likely first call is get_zone_by_zip.
  • For "find average first and last frost dates for a city", the likely first call is get_frost_dates.
  • For "compare planting calendars for crops like tomatoes and kale", the likely first call is get_planting_calendar.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 3, the first on 2026-10-30
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring3 of the 7 daily checks it takes to print a share
  • Median first answer178 ms
  • Space in an agent's context≈ 584 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · look up a hardiness zone from a zip code
  • can do · find average first and last frost dates for a city
  • can do · compare planting calendars for crops like tomatoes and kale

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-30
  • get_zone_by_zip

    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.

  • get_frost_dates

    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.

  • get_planting_calendar

    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.

  • what_to_plant_now

    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.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "grow-zones": {
      "type": "http",
      "url": "https://usgrowzones.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http usgrowzones https://usgrowzones.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://usgrowzones.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.