CannaGLAP
Grow cannabis in Yonkers, NY
Growing cannabis in Yonkers: a season that starts in May and can end by mid October
Yonkers growers get about 157 safe outdoor days, and both ends of that window bite. At the Dobbs Ferry-Ardsley station, about 6 miles away, the safe date for spring frost to be gone is May 6, and in an early year fall frost is back by October 10.
A plant that flowers deep into October does not fit that window. So which plant are you actually setting out in May?
Adults 21 and over: yes. Plant limit: 3 mature + 3 immature per adult; 6 mature + 6 immature per residence.
Secure location, not accessible to under 21s; not plainly visible from public view. Source: NY OCM home cultivation FAQ. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
A Yonkers indoor setup that feeds the short window
The season starts under lights. Seeds go in indoors from March 25 to April 8, while March still averages about 18 freezing nights and lows near 31°F. A tent in the basement of a two-family house, or in an apartment off McLean Avenue, runs cooler than young plants like once the lamp switches off. A seedling mat and an overnight light schedule keep roots growing through April.
Summer here is wet more than hot. July averages 86°F with about 7 days at 90°F or warmer, but July and August each averaged 75 percent humidity, and September 72. That is the air a flower room breathes. Keep a dehumidifier running in the tent's room from July on, space the colas, and aim a fan through the canopy, not just across the top.
Fall resets the house. October lows drop to about 45°F and November to 36°F, the heat comes on, and heated indoor air runs dry. A tent that fought damp in August may need a humidifier for clones by November. If it sits in an unheated, damp basement, keep the dehumidifier there through winter instead.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 43 | 51 | 63 | 73 | 81 | 86 | 84 | 77 | 65 | 54 | 45 |
| Avg low °F | 23 | 25 | 31 | 40 | 50 | 59 | 64 | 63 | 56 | 45 | 36 | 29 |
| Humidity % | 72 | 68 | 75 | 75 | 72 | 64 |
Highs and lows: NOAA 1991 to 2020 normals, Dobbs Ferry-Ardsley station (6.2 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Outdoors in Westchester County
New York allows 3 mature and 3 immature plants per adult, up to 6 of each per residence, kept in a secure place that people under 21 cannot get into and that is not plainly visible from public view. A backyard grow has to meet both conditions.
Set plants out May 6 or later, when nights have averaged 45°F since about May 1. From there you have about 157 days to the early frost date of October 10, and 16 more in a typical year, when the first frost comes around October 26. Autoflowers and fast photoperiods that finish by early October are the safe choice; long-flowering plants risk the cold.
| Last spring frost | Apr 20 in a typical year, May 6 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Oct 26 typical, as early as Oct 10 (1 year in 10) |
| Frost-free season | about 189 days |
| Nights stay 50°F or warmer | May 17 to Oct 2 |
| Start seeds or clones indoors | Mar 25 to Apr 8 |
| Move plants outdoors | May 6 or later |
Close quarters, closed records
In a Yonkers two-family house, the other unit is one wall away, and the upstairs neighbors may see straight into the backyard. The lock keeps the plants secure. The grow log deserves the same care.
Canna GLAP scrambles your grow journal on the phone itself, before upload. If someone breached our servers, they would get grow records no one can read, without the key to change that. Compare notes with other growers at Yonkers Riverfest if you want; what you share is your call.
What is encrypted: your plants, notes, photos, feed logs and harvests. What is not: account details (such as your email, name and plan), a grow name or town if you type one, your team, and your sensors' names. The full list: what a hacker would get.
Questions growers in Yonkers ask
When should I plant cannabis outside in Yonkers?
May 6 or later. Start seeds indoors from March 25 to April 8, then move plants out once frost risk has passed and nights average 45°F.
How long is the outdoor season in Yonkers?
About 157 days, from May 6 to the early frost date of October 10. In a typical year frost holds off until around October 26, but plan harvests for early October.
Do I need a dehumidifier for a Yonkers grow?
In summer, yes: July and August averaged 75 percent humidity, which invites mold in a dense flower canopy. In winter a heated home runs dry, so only an unheated, damp basement needs one then.
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