CannaGLAP
Grow cannabis in Las Cruces, NM
Growing cannabis in Las Cruces: a long season, and much of it above 90°F
Las Cruces hands you one of the longest outdoor seasons a grower can ask for, about 198 days. The catch is what fills it. At the State University station, around 109 days a year hit 90°F or higher, starting in April and still 14 in September, and June humidity averages just 23 percent.
Frost is not your opponent here. The sun is. So what is your grow doing between noon and 5 p.m. in June?
Adults 21 and over: yes. Plant limit: 6 mature + 6 immature per person; no more than 12 mature per household.
Limit as worded in the statute (NMSA 26-2C-25); the Cannabis Control Division's web page words the count differently, so read both. Source: NMSA Chapter 26, Article 2C. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
Cooling a Dona Ana County tent
Heat runs the indoor calendar from May into September. June is the hottest month, with a 96°F average high, and July sits right beside it. A garage tent near New Mexico State University or the Mesilla Plaza climbs well past that with the lamps on, so run lights through the night and keep them off all afternoon. Nights average 64 to 69°F from June through August, so exhaust air cools the tent after dark.
Dry air is the second front. Humidity averages 23 percent in June and stays in the low 30s through September, so leaves lose water faster than young roots can replace it. A humidity dome for the first week, a small humidifier through veg, and a finger in the pot before every watering beat any bottle of nutrients.
That same dryness pays off in flower. September and October average about 30 percent humidity, so the bud rot that ruins harvests in wetter places rarely gets a start here. Spend on cooling, not a dehumidifier.
Winter brings the desert's wide daily swing indoors. January averages a 59°F high and a 30°F low, and the city sees about 69 freezing nights a year. Insulate the floor under a garage tent, keep a heat mat under young plants, and let the lights run through the cold hours before dawn.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 59 | 64 | 71 | 79 | 87 | 96 | 96 | 94 | 88 | 80 | 68 | 58 |
| Avg low °F | 30 | 34 | 39 | 46 | 54 | 64 | 69 | 68 | 61 | 48 | 37 | 30 |
| Humidity % | 45 | 23 | 34 | 32 | 33 | 27 |
Highs and lows: NOAA 1991 to 2020 normals, State Univ station (2.6 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Las Cruces outdoors: plant early, shade often
New Mexico's statute counts plants per person: six mature and six immature each, with no more than 12 mature plants in one household. The state's Cannabis Control Division states the count another way on its website, so check both before you plan a bigger garden. Sow seeds or root clones inside in early March (the 4th through the 18th), and set plants outside no sooner than April 15. The last frost typically comes around March 12 and is gone by April 2 most years.
The hard part is carrying young plants through May and June: May already brings about 12 days of 90°F heat, and June about 27. Use large pots or plant in the ground, mulch heavily, water in the early morning, and give them shade from mid afternoon on. Fall-flowering plants have time to finish, since the first frost typically comes around November 13, and only one year in ten as early as October 30.
| Last spring frost | Mar 12 in a typical year, Apr 2 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Nov 13 typical, as early as Oct 30 (1 year in 10) |
| Frost-free season | about 241 days |
| Nights stay 50°F or warmer | May 1 to Oct 12 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
Desert lessons stay yours
The Mesilla Valley has a long farming history, from pecans to chile, and no shortage of opinions on growing. Your own numbers are different, because a 96°F June taught you each of them. In most grow apps, those sit on a company's server in plain, readable form.
Canna GLAP encrypts each grow entry while the data is still on your phone. If our servers were ever broken into, the intruder would get grow records that read as noise, with no key in reach. The desert know-how you built stays with you.
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 Las Cruces ask
When can I plant cannabis outdoors in Las Cruces?
No earlier than April 15. Frost is usually gone by early April and nights average 45°F from April 12; give seeds or clones an indoor start in the first half of March.
How do I protect cannabis plants from Las Cruces summer heat?
Expect about 27 days of 90-degree heat in each of June and July. Run tent lights at night; outdoors, mulch, water early and shade the afternoon sun.
Do I need a dehumidifier to grow in Las Cruces?
Rarely. September and October average about 30 percent humidity, so mold pressure stays low. Young plants usually need more moisture, not less.
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