When to plant tomatoes in Annapolis: 20 April – 30 July

In Annapolis, tomato: sow for seedlings from 6 February to 8 June; plant into a greenhouse from 30 March to 30 July; plant out into open ground from 20 April to 30 July. For plants and seeds, the places nearby include Bru-Mar Gardens LLC (garden centre, 3 km) and Garcia Patios & Landscaping (garden centre, 8 km); addresses and opening hours are below.

Tomato in Annapolis: soil, season and weather

In Annapolis the soil, not frost, sets the date: the last frost is over around 29 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 20 April, 22 days later.

Last spring frost	29 March
Top 7 cm of soil at 15 °C	20 April, 22 days after the last frost
Into an unheated greenhouse	30 March – 30 July; March outside: 3.5 °C at night, 13 °C by day; card 16–27 °C
First autumn frost	19 November, 213 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	29 June – 8 October
Days left for picking	143
Daylight	11:14 on 27 February, 13:24 on 20 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 8 rainy days

Tomato in Annapolis: care after planting

Planted on 20 April: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

20 April — feed: balanced (NPK)
18 May — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Annapolis during the tomato season

Days average above the tomato card's 16–27 °C in June (27.6 °C), July (30.1 °C) and August (28.5 °C). Months that stay below 16 °C even by day on average: November (13.5 °C). Nights average below 16 °C in April, May and October, November (5.5–13.7 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	18.3	8.6	116	12	13:12
May	22.4	13.7	156	15	14:17
June	27.6	18.6	137	13	14:53
July	30.1	21.9	200	16	14:39
August	28.5	20.8	158	14	13:43
September	25.5	18	145	12	12:29
October	20.1	12	106	9	11:14
November	13.5	5.5	83	8	10:04

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Annapolis, Washington, D.C. is 5 days earlier and Harrisburg 13 days later.

City	Distance	Date	Difference
Baltimore	37 km	16 April – 2 August	4 days earlier
Washington, D.C.	47 km	15 April – 27 July	5 days earlier
Dover	87 km	17 April – 6 August	3 days earlier
Hagerstown	129 km	28 April – 22 July	8 days later
Harrisburg	148 km	3 May – 22 July	13 days later
Philadelphia	158 km	29 April – 22 July	9 days later

Where to buy tomato plants and seeds near Annapolis

Buy plants ready to set out from 20 April to 30 July (from 30 March to 30 July for an unheated greenhouse); seed for raising your own is sown from 6 February to 8 June. Within 15 km of Annapolis OpenStreetMap lists 6 garden centres and 1 farm shop (collected 28 October 2026).

Bru-Mar Gardens LLC — garden centre
Bay Ridge Road 1009, 21403 Annapolis · Mon–Sat 09:00–18:00; Sun 09:00–17:00 · 3 km · brumargardens.com
Garcia Patios & Landscaping — garden centre
Central Avenue 565, 21037 Edgewater · Mon–Fri 09:00–17:00 · 8 km · garciapatiosandlandscaping.com
Gary's Gardens — garden centre
Governor Ritchie Highway 651, 21146 Severna Park · 12 km
Anne Arundel County Lawn and Garden Center — garden centre
Jumpers Hole Road 478, 22146 Severna Park · 15 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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