This free spinach planting calendar builds a full season plan for spinach from your frost dates. Spinach is a true cool-season crop, sown directly about six weeks before the last frost, and harvested fast, about forty days later, before heat makes it bolt. It runs fully in your browser, so nothing you type is sent to a server, and you need no account and no sign-up to use it.
Frost dates are the anchor of vegetable gardening. The last spring frost tells you when tender plants can safely go outside, and the first autumn frost tells you when the season ends. A calendar built on those two dates turns guesswork into a simple list of dates you can act on.
To use the tool, enter your average last frost date, and your average first frost date if you know it. Press the main button and the tool lists every key date for the season at once. If your dates change, update the fields again, and the new calendar shows right away.
Example: with a last frost on 15 April, direct sowing falls on 4 March, and the first harvest around 13 April, with picking continuing for several weeks in cool weather.
Tip: sow spinach thickly and thin later. Dense sowing covers the soil, and thinning gives young leaves for salads while the rest grow on.
Tip: keep spinach cool and moist. Heat is the enemy, so a partly shaded spot and steady watering extend the harvest by weeks.
Tip: pick outer leaves and let the centre grow. A cut-and-come-again habit turns a short spinach season into several good pickings.
Common question: Can spinach survive a frost? Yes. Spinach is very frost-hardy, and established plants often survive winter in mild climates, giving an early spring harvest.
Common question: Why did my spinach bolt so fast? Heat and long days cause bolting. Sow early in spring or again in late summer for autumn leaves, and avoid the hottest weeks.
Common question: Do I need to know my exact frost dates? No. Use the average dates for your town. The calendar is a planning guide, and a week either way still gives a good season.
Please note that these dates are a planning guide, not a weather forecast. A late cold snap can still damage tender plants, so watch the forecast in spring and cover plants when frost threatens, even if the calendar says the season has started.
Privacy matters for garden planning too, and this tool is built for that. Everything you enter stays in the browser on your own device. There is no account, no upload, and no shared copy, so your garden plans never travel beyond your own screen.
A good habit is to print or save your calendar at the start of the season and pin it where you plan the garden. Checking dates at a glance beats searching for them again, and a visible plan is one you actually follow through the busy spring weeks.
Start seeds on time, not early. Seeds started too early grow leggy indoors and struggle outside, while seeds started on the calendar date are strong, compact, and ready when the weather is right. Timing matters more than extra weeks indoors.
Keep notes on your own dates through the season. Your garden, your soil, and your microclimate shift the ideal dates a little each year, and your own notes turn a general calendar into a personal one that gets better every season.
This tool is free to use as often as you like. Bookmark it, run it for each crop you grow, and let it carry the date planning while you focus on the garden itself.