CannaGLAP
Grow cannabis in Apache Junction, AZ
Growing cannabis in Apache Junction: a harvest timed between September heat and a November frost
At the foot of the Superstition Mountains, a grow has two clocks running. One is heat: September still averages 99°F in the afternoon, with about 29 days at 90 or hotter. The other is frost: it holds off until December 10 in a typical year, but one fall in ten it arrives by November 19.
Between them sits October, with highs near 88°F and lows near 60. So the real question is timing: will your plant be ripe inside that window, or outside it?
Adults 21 and over: yes. Plant limit: 6 per adult at primary residence; 12 per residence with 2+ adults.
Enclosed area with a lock that keeps minors out; not visible from public view. Source: A.R.S. 36-2852. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
Inside in Pinal County: built for the hot half
June through September averages 29 to 31 days a month at 90°F or hotter, and July lows still sit near 77°F, so a garage soaks up heat all day and gives little of it back at night. A spare room on the house air, or a garage or insulated shed with its own window unit, is the place for a summer run.
June averaged 20 percent humidity, then the readings climbed to 27 in July and 30 in August before falling back to 23 in September and October. Clones and seedlings struggle most in that dry June, so a dome and a small humidifier earn their place early. Later, buds hung in 23 percent October air dry fast and lose aroma, so dry them slowly in a closed, cooled room with a hygrometer.
Winter is mild but not frost-proof. The station, 5.1 miles away at 2,070 feet, records about 7.6 freezing nights a year, about 3 of them in December, and lows near 42°F to 43°F in December and January. A detached garage or shed can drop close to freezing on the worst nights, so keep the root zone warm and let the lamps run through the small hours from December into February. January's 61 percent outdoor humidity matters little in a heated room, which runs dry.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 67 | 70 | 77 | 85 | 93 | 103 | 105 | 104 | 99 | 88 | 76 | 66 |
| Avg low °F | 43 | 44 | 48 | 53 | 60 | 69 | 77 | 76 | 71 | 60 | 50 | 42 |
| Humidity % | 61 | 20 | 27 | 30 | 23 | 23 |
Highs and lows: NOAA 1991 to 2020 normals, Apache Junction 5 Ne station (5.1 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
The Apache Junction outdoor window
Arizona permits 6 plants per adult at a primary residence, with a cap of 12 per residence when 2 or more adults live there, and every plant must stay in an enclosed area with a lock that keeps minors out, where the public cannot see it. A greenhouse could work only if it is enclosed, locked and hidden from view in exactly that way.
If your space qualifies, sow indoors between March 4 and 18; plants go out April 15. Frost is usually gone by February 11 and safely gone by March 7, so the date is about rooting plants before May, which brings about 23 days at 90°F. From April 15 to the early frost on November 19 is about 218 days, room for many photoperiod plants. Pick strains that finish in October: they flower through the September heat, so afternoon shade and daily watering matter, but they come down before nights near 50°F in mid November turn to frost.
| Last spring frost | Feb 11 in a typical year, Mar 7 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Dec 10 typical, as early as Nov 19 (1 year in 10) |
| Frost-free season | about 304 days |
| Nights stay 50°F or warmer | Mar 30 to Nov 15 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
A winter town with plenty of neighbors
Apache Junction's population swells each winter as snowbirds come back to the foot of the Superstitions, and the town turns out for Lost Dutchman Days. More neighbors means more people who notice a new fan running in a garage, and a few who grow themselves and would like to know how you got through September.
Canna GLAP encrypts your grow journal on the phone before upload. A break-in at our servers would turn up only scrambled grow records, with no key among them. What a hot season taught you stays yours to share or keep.
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 Apache Junction ask
When should I harvest outdoor cannabis in Apache Junction?
Aim for October. Highs fall to about 88°F and lows to about 60, while the early first frost holds off until November 19.
Does it freeze in Apache Junction?
A little. The station averages about 7.6 freezing nights a year, about 3 of them in December, so a tent in a detached garage or shed needs some winter heat.
Can I grow cannabis in my garage in Apache Junction?
Only with dedicated cooling in summer. June through September brings 29 to 31 days a month at 90°F or hotter, and July nights average about 77°F, so a bare garage stays hot day and night.
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