All Gardening Calculators

21 free tools powered by USDA zone data and agricultural research.

⚡Live Data Tools

Real-time tools that pull your ZIP's live weather, 30-year frost history, and variety databases.

Cover-or-lose list for tonight

Red/yellow/green based on 14-day forecast

Frost Probability

NOAA-style exceedance for any date

Seed Start Calendar

Indoor start dates with ICS download

Chill Hours Tracker

Live fruit tree chill accumulation

📅Planning & Timing

Know exactly when to plant, start seeds, and harvest in your zone.

When to plant by ZIP code

First and last frost by ZIP

Season length by zone

Succession Planting

Stagger for continuous harvest

When to start seeds indoors

When your crop will be ready

📐Garden Design

Plan your beds, calculate soil, and figure out spacing.

Soil Calculator

How much soil for your bed

Plan your raised bed layout

Square Foot Garden

SFG spacing planner

How many plants fit

💧Plant Care

Keep your plants healthy with the right companions, nutrients, water, and light.

Companion Planting

What grows well together

NPK ratios for your plants

Watering Schedule

How much and how often

Match plants to your light

pH matching and amendments

Identify and treat pests