Local planting guide · Mountain West
zip 80126
Littleton is in USDA hardiness zone 6a, with average winter lows of -10°F to -5°F. The local growing season runs roughly 05/05 through 10/08 (~154 days). This zip falls within the Mountain West growing region.
- USDA zone
- 6a -10°F to -5°F
- Last spring frost
- 05/05
- First fall frost
- 10/08
- Growing season
- 154 days
- Compatible crops
- 87
- Growing region
- Mountain West
Right now in Littleton
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Littleton
Littleton sits at the edge of zone 6a, where winter extremes (lows of -10 to -5°F) intersect with a compressed growing season. The 154-day frost-free window between May 5 and October 8 is workable but short, and the last-frost date of May 5 is notably late, some eight to ten days behind warmer regions of zone 6a. This timing creates a specific challenge: spring growth happens fast once soil warms, but a hard freeze in early May can still demolish early-blooming fruit buds.
The sample crops here (apple, pear, peach, both European and Japanese plums, and cherry) reflect what actually thrives in the Denver metro climate. These stone fruits and pomaceous crops are not accident-prone for Littleton; they are the reliable choice. Peaches and Japanese plums, which might struggle in colder zone 5 locations, do well here because of the zone 6a winter hardiness and sufficient chilling hours. The area accumulates around 600 to 700 chill hours, though the exact count varies by microclimate. Pears and apples are the lowest-maintenance fruit options.
The semi-arid, high-altitude climate brings advantages too. Disease pressure from fungal blights is moderate compared to humid regions. But the short season, late spring frost, and typically dry conditions are the dominant constraints shaping what succeeds and what doesn't.
Regional context · Mountain West
What the Mountain West brings to Littleton
High elevation, dry air, intense sun, big diurnal swings. Short cool growing season at altitude; longer hot one in valleys. Strong fruit production in irrigated river corridors.
Common challenges
Issues that most often defeat home gardeners in zone 6a, drawn from the broader USDA zone profile.
- ▸ Brown rot in stone fruit
- ▸ Japanese beetles
- ▸ Spring frost damage to peach buds
What defeats new gardeners in Littleton
The May 5 last-frost date is the primary constraint for Littleton gardeners. This is late enough that early-blooming fruits, especially peaches, cherries, and some plum varieties, frequently lose flower buds to a May freeze. The damage is straightforward: a hard frost at the wrong moment in late April or early May kills the reproductive tissue before bloom fully unfolds. Recovery takes a full year.
The second major challenge is the short season itself. With only 154 days between frost dates, crops requiring long warm periods (some melon and pepper varieties) are marginal unless started indoors well before May 5. The first fall frost arrives reliably by October 8, cutting short the last window of tomato ripening and other late-season crops.
Dryness is the third constraint. The semi-arid climate typical for the Denver metro area means plants need consistent water; spring winds and intense sun accelerate soil moisture loss. Even established trees can suffer if irrigation isn't maintained through the growing season.
Crops that grow in Littleton
87 crops from our catalog match zone 6a, grouped by type.
Tree fruit
12 crops
zone 6a Apple
Malus domestica
zones 3a–9a
zone 6a Pear
Pyrus communis
zones 4a–8b
zone 6a Peach
Prunus persica
zones 5a–9a
zone 6a European Plum
Prunus domestica
zones 4a–8a
zone 6a Japanese Plum
Prunus salicina
zones 5b–9a
zone 6a Sweet Cherry
Prunus avium
zones 5a–8a
zone 6a Sour Cherry
Prunus cerasus
zones 4a–7b
zone 6a American Persimmon
Diospyros virginiana
zones 4b–9a
Berries
20 crops
zone 6a Highbush Blueberry
Vaccinium corymbosum
zones 4a–7b
zone 6a Lowbush Blueberry
Vaccinium angustifolium
zones 3a–6b
zone 6a Red Raspberry
Rubus idaeus
zones 3b–8a
zone 6a Black Raspberry
Rubus occidentalis
zones 4a–8a
zone 6a Yellow Raspberry
Rubus idaeus
zones 3b–8a
zone 6a Blackberry
Rubus subgenus Rubus
zones 5a–9a
zone 6a June-Bearing Strawberry
Fragaria x ananassa
zones 3a–8b
zone 6a Everbearing Strawberry
Fragaria x ananassa
zones 3b–9a
Nuts
6 crops
Vegetables
40 crops
zone 6a Tomato
Solanum lycopersicum
zones 3a–10b
zone 6a Sweet Pepper
Capsicum annuum
zones 4a–10b
zone 6a Hot Pepper
Capsicum species
zones 4a–10b
zone 6a Eggplant
Solanum melongena
zones 5a–10b
zone 6a Potato
Solanum tuberosum
zones 3a–9a
zone 6a Cabbage
Brassica oleracea var. capitata
zones 3a–9b
zone 6a Broccoli
Brassica oleracea var. italica
zones 3a–9a
zone 6a Cauliflower
Brassica oleracea var. botrytis
zones 3b–9a
Herbs
9 crops
zone 6a Basil
Ocimum basilicum
zones 4a–10b
zone 6a Parsley
Petroselinum crispum
zones 3b–9b
zone 6a Cilantro / Coriander
Coriandrum sativum
zones 3b–9b
zone 6a Dill
Anethum graveolens
zones 3b–9a
zone 6a Oregano
Origanum vulgare
zones 4a–9b
zone 6a Thyme
Thymus vulgaris
zones 4a–9a
zone 6a Sage
Salvia officinalis
zones 4a–9a
zone 6a Mint
Mentha species
zones 3b–9b
Plan the year
Planting calendar for Littleton
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Littleton's local frost dates.
Week ? · loading
This week in Littleton, CO (zone 6a)
Quiet week in Littleton, CO (zone 6a). this week is a good time to step back and plan ahead.
Nothing critical on the calendar this week.
434 bars · 87 crops
Calendar logic combines NOAA frost normals with crop-specific timing data. Local microclimate and weather always overrules the calendar; use this as a starting point.
Top pests for zone 6a
Ranked by how many crops in your zone they affect. Click through for IPM controls and signs to watch for.
Multiple species (Aphididae)
Small soft-bodied sap-sucking insects that reproduce explosively in spring. Excrete honeydew that supports sooty mold and attracts ants. Transmit viral diseases.
Odocoileus species
Whitetail and mule deer browse can devastate orchards and gardens, particularly in winter when food is scarce. Antler rub on young trunks kills saplings outright.
Multiple species
Robins, catbirds, mockingbirds, starlings, cedar waxwings and other songbirds can strip ripening berry and fruit crops in days. Crows and blackbirds also damage fresh sweet corn ears in milk stage. The single biggest yield-loss factor in unprotected home plantings.
Sylvilagus and Lepus species
Cottontails and jackrabbits strip bark from young fruit trees in winter and graze tender garden vegetables year-round, especially seedlings.
Popillia japonica
Defoliating beetle introduced to North America in 1916. Skeletonizes leaves of many fruit trees, berry canes, and pecan.
Multiple species (Chrysomelidae)
Tiny black or bronze jumping beetles that put hundreds of small holes in seedling leaves. Most damaging on direct-seeded brassicas and young eggplant.
Tetranychus urticae
Tiny mite that feeds on leaf undersides, causing stippling and webbing during hot dry weather.
Microtus species
Field voles and meadow voles girdle young fruit-tree trunks under snow cover during winter and chew root crops. The leading cause of mysterious orchard losses.
Top diseases for zone 6a
Ranked by how many crops in your zone they affect. Click through for symptoms, controls, and resistant varieties.
Botrytis cinerea
Ubiquitous fungal disease that causes fruit rot during cool wet weather, often the dominant berry disease in humid regions.
Pseudoperonospora cubensis (cucurbits) and others
Water mold (oomycete, not a true fungus) that thrives in cool damp conditions. Spreads rapidly through cucurbit and brassica plantings on wind-borne spores.
Pythium and Rhizoctonia species
Soil-borne complex of water molds and fungi that kill seedlings before or shortly after emergence. The single most common cause of seed-starting failures.
Cucumber mosaic virus, Tobacco mosaic virus, and others
Family of plant viruses producing mottled yellow-and-green leaf patterns. Vectored primarily by aphids; some are seed-transmitted or spread by handling tools and tobacco products.
Agrobacterium tumefaciens
Soil-borne bacterium that enters plants through wounds and induces tumor-like galls on roots, crown, and lower stems. Galls reduce vigor and shorten plant lifespan; on Rubus the disease is often fatal.
Fusarium oxysporum
Soil-borne fungal disease that plugs vascular tissue and kills affected plants. Persists in soil for many years; impossible to eliminate once established.
Sclerotium rolfsii
Soil-borne fungal disease most damaging in warm humid Southern conditions. White mycelial fans and small mustard-seed-sized sclerotia at the soil line are diagnostic.
Plasmodiophora brassicae
Soil-borne disease causing characteristic distorted club-shaped roots on brassicas. Persists in soil for 10-20 years; the dominant brassica pathogen in acidic poorly-drained soils.
Companion planting suggestions
Beneficial pairings drawn from companion data, filtered to crops that grow in zone 6a.
- Peach + Garlic
Garlic planted around peach trees suppresses peach borer and provides general fungal-pressure reduction.
- European Plum + Garlic
Garlic discourages plum curculio and provides general antifungal benefit beneath stone fruit.
- American Persimmon + Pawpaw
Both natives thrive in similar soils and contribute to a polyculture that supports native pollinators and fauna.
- Jujube + Thyme
Thyme groundcover suits jujube's low-water profile and deters cabbage moth and aphid populations.
- Apricot + Basil
Basil's volatile oils discourage stone-fruit pests and support pollinator visits.
- Highbush Blueberry + Thyme
Creeping thyme thrives in the acidic mulched conditions blueberries require and attracts pollinators during bloom.
Soil types reference
Soil texture and pH decide what grows easily on your specific lot. Find the closest match below for crop recommendations and amendment guidance.
Practical tips for Littleton
Choose late-blooming peach and cherry varieties. These bloom after the May 5 frost date, eliminating the primary source of crop failure in Littleton. When selecting cultivars, ask your nursery for bloom-time information and prioritize varieties known to bloom later in spring.
Establish watering discipline by mid-May. Littleton's semi-arid climate means soil is dry when the growing season starts. Consistent irrigation from May through the growing season supports root development and fruit set. Drip irrigation or soaker hoses conserve water and deliver it reliably.
Succession-plant vegetables within the 154-day window. Tomatoes, peppers, and other warm-season crops go in after May 5. Cool-season crops (lettuce, spinach) can start as soon as soil is workable, then be replanted in August for a fall harvest before the October 8 frost. Start seeds indoors to extend the usable season.
Frequently asked questions
- What are the most reliable fruit trees for Littleton?
Apples, pears, peaches (late-blooming varieties), and both tart and sweet cherries are the most reliable. European and Japanese plums also do well. These crops are naturally cold-hardy to zone 6a and fit the local frost and season patterns.
- When should I plant fruit trees or start seeds?
Plant or start seeds after the May 5 last-frost date. Fruit trees and stone fruits can be planted in spring or fall, but spring planting gives roots time to establish before winter. Don't set out warm-season crops (tomatoes, peppers) before late May.
- How do I protect fruit trees from spring frosts?
Choose late-blooming varieties, the most reliable approach. If an unexpected frost is forecast after buds have broken, burlap-wrap or spray water over blossoms before sunrise to insulate against freeze damage. Monitor local frost forecasts from early April through mid-May.
- Can I grow tomatoes in Littleton?
Yes, but time matters. Plant after May 5 and expect the first frost around October 8, giving you about five months. Select early-to-mid-season varieties (70 to 85 days to maturity) to harvest before the fall freeze. Start seeds indoors 6 to 8 weeks before the last frost date.
- What about the very hot, dry summers here?
Consistent irrigation is essential, especially for newly planted trees and during July and August. Mulch around trees to retain soil moisture. The semi-arid climate reduces fungal disease pressure (an advantage), but water availability is the limiting factor in summer.
- Is the short 154-day season a problem?
Not for cold-hardy perennials like fruit trees. It does limit warm-season annuals (tomatoes, melons), but early-season varieties work well. Succession planting (cool-season crops in spring, again in late summer) maximizes yield from the available window.
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Frost data: NOAA Climate Normals 1991-2020, station USW00093067. Local microclimates can shift these dates by a week or more.
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