According to almanac tradition, tomatoes belong to the “fruit” type of crop, which gardeners who plant by the Moon put in during the second quarter, from first quarter to full moon. The tradition adds a Moon sign: Cancer is labeled fruitful, Libra semi-fruitful and Scorpio fruitful. The old rule is not proven science. For 2027, the traditional windows run from February 17-18 to June 12-16, listed in full below.
What the tradition says about planting tomatoes
The almanac rule is a quarter system. A lunar cycle lasts 29.53 days, and old gardening almanacs cut it into four parts, each assigned a type of crop. Planting by the moon starts from that idea. Tomatoes land in the second quarter because they bear seed inside the fruit and grow above ground, which is the almanac definition of a fruit crop.
| Quarter | Moon phase span | Crop type in the tradition | Examples |
|---|---|---|---|
| 1 | New moon to first quarter | Leafy crops that bear above ground | Lettuce, spinach, cabbage, broccoli, celery |
| 2 (tomatoes) | First quarter to full moon | Fruit: above-ground crops that bear seed inside the fruit | Tomatoes, peppers, beans, squash, corn |
| 3 | Full moon to last quarter | Root crops, bulbs, perennials | Potatoes, carrots, garlic, onions, beets |
The fourth quarter, from last quarter to new moon, is a rest period in this tradition. It is set aside for weeding, pruning, turning the soil and composting, not for sowing or setting out plants.
No effect of the Moon on tomatoes has been proven. The astronomy gives a hint of why. The Moon’s tidal pull at the Earth’s surface is about 1.1 millionths of a meter per second squared at its strongest, roughly one ten-millionth of gravity. That is far too small to move anything as small as a seed or a root. Oceans are another matter, since they are large enough for that pull to add up. A tomato transplant in a garden bed is not.
So why does the custom survive? Mostly because it is old, easy to follow and gives a gardener a reason to look at the sky before picking a day. The figures come from NASA’s Moon Fact Sheet, which also gives the 27.32-day orbit against the stars and the mean distance of 384,400 km.
Then comes the sign layer. According to the almanac convention, the Moon passes through the zodiac signs, and each sign carries a label. Cancer, Scorpio and Pisces are labeled fruitful, Taurus, Libra and Capricorn semi-fruitful. Aries, Gemini, Leo, Virgo, Sagittarius and Aquarius are labeled barren, though sources differ on Virgo, Sagittarius and Aquarius. The windows below combine both rules: a second-quarter Moon in a fruitful or semi-fruitful sign.
Traditional tomatoes planting days, 2026 and 2027
The windows month by month
Each row shows the days when the second quarter and a fruitful or semi-fruitful sign overlap, with the Moon sign read at noon Eastern time (ET). In the convention’s labels, Cancer is fruitful, Libra semi-fruitful and Scorpio fruitful.
| Month | Traditional days for fruit crops | Moon sign (convention label) |
|---|---|---|
| February 2027 | February 17-18 | Cancer (fruitful) |
| March 2027 | March 16-17 | Cancer (fruitful) |
| April 2027 | April 19-20 | Libra (semi-fruitful) |
| May 2027 | May 16-19 | Libra/Scorpio (semi-fruitful, then fruitful) |
| June 2027 | June 12-16 | Libra/Scorpio (semi-fruitful, then fruitful) |
How to read the edges
The months shown are those when gardeners in much of the country plant tomatoes. Your state may start earlier or later, so only the rows that fall inside your state’s own planting window count for you. A row that comes before your window opens, or after it closes, is just a date on a calendar.
The days are read at noon ET, and the Moon changes sign during the day. Treat the first and last day of each run as soft edges. On May 16 or June 12, for instance, the Moon may have entered the sign only part of the way through the day, or may leave it before the day is over. If you follow the tradition strictly, the middle of a run is the firmer ground and the outer days are the ones to hold loosely.
Time zones add a small wrinkle. These dates are fixed to Eastern time, so a gardener on the Pacific coast may see a sign change land on a different clock hour than a gardener in Maine. The span of a run stays the same, but where the edges fall in your own day can shift.
One more caution about the table itself. It lists traditional days, which is a different thing from a planting forecast. Nothing in it tells you whether the soil in your yard is ready. For that, the state guides below are the place to look.
Check your state first: when to plant tomatoes where you live
The order of decisions matters here. Start with your state’s planting calendar for tomatoes. Then, only if you want to, look at the Moon. Frost dates and soil temperature decide whether tomatoes can go in the ground, and the Moon never overrides the calendar of your place. If you follow the tradition, it only chooses among days that are already open to you.
The page when to plant tomatoes where you live is where the practical timing sits. It covers the dates, the soil conditions and the frost considerations for tomatoes, and none of that is repeated here. If you already know your state, the state guides list every state calendar on this site. A gardener in Ohio can go straight to the Ohio planting calendar for tomatoes, and the same goes for the other states in the guides.
Once you have your state’s window in hand, the Moon step is short. Put the window next to the table above and see which rows, if any, fall inside it. Some years a row will land comfortably within your window. Other years none will, or the only row that does will be an edge day with a sign change. In that case the planting date comes from your state calendar alone, and nothing in the almanac rule says otherwise.
Gardeners who follow the Moon usually treat it as a tiebreaker, not a gate. If your state’s calendar leaves you a few weeks to choose from, a traditional day can be the one you pick. If the calendar leaves you only a few days, the calendar decides.
A fair way to try it
If you are curious about the tradition, a simple comparison inside your own garden is the only way to judge it for your own plot.
- Pick a week that sits inside your state’s planting window and contains at least one traditional day from the table.
- Split your tomato planting in two. Put half in on the traditional day and half on an ordinary day in the same week, using the same variety, the same kind of bed and the same watering.
- Label both groups clearly with plant tags, so you cannot mix them up by midsummer.
- Keep notes on when each group emerges or establishes, and when each begins to harvest, along with the number of fruits picked.
- Repeat the comparison in the next season, using the windows for that year.
Be honest about what the result can tell you. One season will not settle anything. Weather, sun, soil and the plants themselves vary from one bed to the next, and a single difference between two groups of plants can come from any of those. Several seasons of labeled notes still will not prove the tradition for anyone else, but they are the one way a home gardener can see whether the pattern shows up on the plot they actually tend.
Questions about planting tomatoes by the moon
Does the tradition say to plant tomatoes in a waxing or a waning moon?
Waxing. The almanac rule is the second quarter, which runs from first quarter to full moon, so the Moon is growing in light. The third quarter, from full moon to last quarter, is waning and is given to root crops in the tradition. For more on that half of the cycle, see planting in a waxing moon.
What if a traditional day falls on a frost?
Frost dates and soil temperature decide, and the tradition gives way to them. The Moon, if you follow it, only chooses among days that your state’s calendar already allows. If a traditional day does not fit your local window, skip it and use the next row in the table, or plant by your state’s calendar alone. Check the state guides for the timing in your area.
Do I need to follow the Moon sign as well?
Only if you want the full almanac version. The quarter rule can be followed alone, and many gardeners who plant by the Moon stop there. The table above adds the sign layer, using the convention that labels Cancer, Scorpio and Pisces fruitful and Taurus, Libra and Capricorn semi-fruitful. A different scheme exists in biodynamic gardening, following Maria Thun, which sorts days into root, flower, leaf and fruit by sign and counts Aries, Leo and Sagittarius as fruit days. That scheme does not match this table, so pick one system and stay with it.