Gardening with kids: the best weekend this month to plant together

Not the frost date on the seed packet. The right weekend to plant with children is the first warm, dry Saturday after the risk has passed — the one where small hands can be in the soil for an hour without anybody getting cold. Here is how to find it.

Updated 16 September 2026.

Two different questions

“When can I plant?” is a question about frost, and the answer is a date range for your area. “When should we plant, together?” is a question about a particular afternoon, and the answer is a forecast. Gardening with kids lives in the second question. A child does not care that the average last frost is behind you; they care that the ground is not cold, the wind is not whipping the seed packets away, and it is not about to rain on the thing they just planted.

First, the frost part, briefly

The National Weather Service describes frost as forming when temperatures of the Earth's surface and earthbound objects falls below 32°F, and issues a frost advisory during the growing season when widespread frost formation is expected over an extensive area, when surface temperatures are usually in the mid 30s Fahrenheit. NWS glossary: frost. So the practical rule for tender seedlings is: wait until the overnight lows in the forecast are staying comfortably above the mid-thirties, not just above freezing, and look up your area's typical last-frost range from your state's cooperative extension service, which publishes it by county.

Hardy things — peas, radishes, spinach, lettuce, potatoes — go in weeks before that and shrug off a light frost. Tomatoes, beans, squash, cucumbers and most flowers do not. If you are planting with children, the hardy things are the better first job anyway: they come up fast, and a radish is ready before a child has forgotten planting it.

Then, the weekend part

Once the frost risk has passed for what you are planting, you are choosing an afternoon, and the conditions that make a planting afternoon good with children are these:

• Temperature between 58° and 78°. Kneeling on the ground is colder than standing on it; a child on damp soil at 55° is done in twenty minutes.
• Dry for the day, and ideally the day before. Working wet soil compacts it and turns a garden into a mud fight, which is fun once and bad for the beds. Rain chance under 20% through the afternoon.
• Wind under 12 mph. Seed packets, labels, the fine seed itself, a child's patience: wind takes all four.
• Three or four hours in a row, late morning to mid-afternoon. Planting takes an hour; the watering, the labelling and the standing back to look take the rest, and those are the part they remember.

This is the alert we would set: a warm, dry Saturday for the garden, not a frost threshold. Frost is a date you look up once. The good afternoon is a forecast you would otherwise have to watch for a fortnight.

What to plant with children, by how patient they are

• Impatient: radishes (three to four weeks), lettuce leaves, cress on a windowsill while you wait for the garden.
• A little patient: peas and beans, which climb and can be checked daily; sunflowers, which are a competition waiting to happen.
• Patient: potatoes in a bag or a bed — nothing else in gardening beats the moment of tipping them out — and pumpkins for the autumn.
• For the second warm Saturday: tomatoes and squash, once the overnight lows have settled and the frost advisories have stopped.

The order of a good planting afternoon

1. Water the bed the evening before, not the morning of, so the soil is damp but not wet.
2. Let each child own one row or one pot. Ownership is the whole game.
3. Labels first, seeds second. Writing the label is the job a four-year-old can do completely.
4. Water in, gently, with a can they can lift.
5. Stand back and look. Then go inside; the day was the point.

Autumn has one too

The same logic runs in reverse in October: the last warm, dry afternoon before the first frost is the one for lifting the potatoes, cutting the sunflower heads and planting bulbs for spring. We wrote that one up separately: First frost is coming: a last garden afternoon with the children.