San Marzano

Family: Solanaceae Nightshade

Planting Schedule

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Sun-warmed and richly aromatic, San Marzano paste tomatoes ripen to a deep, velvety red with a firm, meaty interior and a pleasantly low-seed count.

Their elongated, tapered shape holds its structure beautifully, delivering a dense, spoonable texture that’s ideal for thick sauces and slow-simmered favorites, as well as roasting for concentrated flavor. Grow these in cool-season confidence for a harvest that tastes unmistakably classic—bright, savory, and beautifully concentrated.

Light: Full SunMaturity: 75 DaysHabit: Indeterminate

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San Marzano Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Apr 27th	Aug 10th	Oct 24th – Jul 15th
Zone 1b	Apr 13th	Jul 27th	Oct 10th – Aug 1st
Zone 2a	Apr 6th	Jul 20th	Oct 3rd – Aug 29th
Zone 2b	Mar 27th	Jul 10th	Sep 23rd – Aug 25th
Zone 3a	Mar 27th	Jul 10th	Sep 23rd – Sep 1st
Zone 3b	Mar 31st	Jul 14th	Sep 27th – Sep 21st
Zone 4a	Mar 27th	Jul 10th	Sep 23rd – Sep 24th
Zone 4b	Mar 25th	Jul 8th	Sep 21st – Sep 27th
Zone 5a	Mar 20th	Jul 3rd	Sep 16th – Sep 30th
Zone 5b	Mar 16th	Jun 29th	Sep 12th – Oct 5th
Zone 6a	Mar 13th	Jun 26th	Sep 9th – Oct 10th
Zone 6b	Mar 7th	Jun 20th	Sep 3rd – Oct 16th
Zone 7a	Mar 2nd	Jun 15th	Aug 29th – Oct 20th
Zone 7b	Feb 20th	Jun 5th	Aug 19th – Oct 28th
Zone 8a	Feb 11th	May 27th	Aug 10th – Nov 5th
Zone 8b	Feb 2nd	May 18th	Aug 1st – Nov 12th
Zone 9a	Jan 16th	May 1st	Jul 15th – Nov 26th
Zone 9b	Dec 22nd	Apr 6th	Jun 20th – Dec 9th
Zone 10a	Continuous Production
Zone 10b	Continuous Production
Zone 11a	Continuous Production
Zone 11b	Continuous Production
Zone 12a	Continuous Production
Zone 12b	Continuous Production
Zone 13a	Continuous Production
Zone 13b	Continuous Production

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Indeterminate
Support Needed	Stake
Planting Depth	Deep
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	10

Culinary Notes

Chef's Note

San Marzano’s low-seed, high-meat flesh cooks down into a dense, velvety sauce without the watery churn you get from juicier slicers. Use it where you need spoonable thickness—its acidity stays bright while it turns deeply savory under a long simmer.

Best Uses

slow-simmered passata-style sauce that clings to pasta
thick tomato ragù or meat sauce where you want minimal watery bleed
roasted wedges or halves for concentrated, jammy edges
pizza sauce base that stays cohesive under heat

Flavor Profile

bright, savory tomato tang dense meaty interior with low seediness low-water, spoonable texture that thickens fast classic roasted-sweet aroma when cooked

Kitchen Pairings

extra-virgin olive oil garlic oregano parmesan mozzarella browned beef or pork

Frequently Asked Questions

What pest or disease most commonly affects Solanum lycopersicum (San Marzano tomato), and how do I manage it?

Early blight and Septoria leaf spot are common on tomatoes, showing up as dark spots with yellowing on lower leaves. Remove and discard infected lower foliage, improve airflow with wider spacing and stake/tie plants upright, and water at the soil line to keep leaves dry. If the problem spreads, spray a labeled tomato fungicide early (start when spots first appear) and repeat according to the label interval.

How often should I water San Marzano tomatoes during the main growing phase?

During active flowering and fruit set, keep soil evenly moist by watering deeply about 1–2 times per week, aiming for consistent moisture rather than daily light watering. Water when the top 1 inch of soil feels dry, and apply enough to soak the root zone (roughly 6–12 inches). Mulch after plants are established to reduce swings in moisture that can trigger blossom-end rot and cracking.

How can I tell when San Marzano tomatoes are ready to harvest?

Harvest when fruits reach full red color (or deep red if grown for slightly firmer fruit) and feel firm but not hard—San Marzano should be elongated and heavy for its size. If you gently lift a ripe fruit, it should detach with minimal force from the vine. Plan harvests around day 75 from transplant (or roughly 70–80 days depending on conditions) and pick often to keep plants producing.