Shallots are the gourmet allium of the Zone 10 autumn garden: plant a bulb in autumn and each one divides into a cluster of mild, sweet bulbs by late spring. They take up little space, store for months, and are far cheaper grown than bought.
Zone 10 at a glance
USDA Zone 10 covers the warmest parts of the United States, including southern Florida, the southern tip of Texas, coastal southern California and Hawaii. Winters are mild, with average winter lows of 30 to 40°F, and the growing season runs nearly all year — frost is rare rather than a regular event.
The average last spring frost in Zone 10 is Jan 15–30 (frost rare), and the average first autumn frost is Dec 15–31 (frost rare). These are zone averages drawn from NOAA frost records, not exact dates for any one garden — always check your local extension service and the forecast before planting tender crops outside. Frost dates vary by microclimate, elevation and year, so treat them as a guide, not a promise. Use our frost date calculator for your zone's averages.
When to plant shallots in Zone 10
Plant shallots from October to December in Zone 10, setting bulbs out in autumn. Shallots are hardy and need a cool growing season to form bulbs: they mature 90–120 days after planting, so autumn plantings are ready in late spring. Like garlic, they use the mild winter to root and grow, then size up as days lengthen. Because Zone 10 has a long, nearly year-round growing season, the question is rarely whether shallots will grow, but whether you plant them in the right season — heat lovers go in after the last frost, cool-season crops go in for autumn and winter.
Shallots planting at a glance
| Detail | Zone 10 guidance |
|---|---|
| Best planting window | October to December |
| Start indoors | Not needed — direct sow |
| Days to germination | 7–14 |
| Days to maturity | 90–120 |
| Spacing | 6–8 in |
| Soil pH | 6.0–7.0 |
| Sun | full sun |
| Water needs | moderate |
| Cold tolerance | hardy |
All figures are broad published ranges from standard horticultural references, and they vary by variety, soil and weather. Check your local extension service for advice on your own garden.
Starting shallots
Plant shallots from bulbs, called sets, rather than seed: push each set into the soil with the pointed end up, leaving the tip just showing above the surface. Space them well apart, as each set divides into a cluster of five or more bulbs. Shallots sprout in 7–14 days in warm autumn soil. Buy sets from a garden supplier rather than the supermarket, where bulbs may be treated or carry disease. Plant on a dry day in soil that is damp but not waterlogged.
Soil, spacing and sun
Shallots need full sun and well-drained, fertile soil with a pH of 6.0–7.0. They hate wet feet, so on heavy soil plant in raised beds and work in compost. Space sets 6–8 inches apart in rows. In Zone 10's sandy soils, compost holds moisture and nutrients that sand lets through. Do not plant shallots where onions, garlic or other alliums grew last year — rotate to fresh ground to avoid soil-borne disease.
Watering and feeding
Shallots have moderate water needs and grow best with steady moisture in autumn and winter, then drier conditions as harvest approaches. Water after planting and during dry spells, but cut back sharply once the bulbs start to swell and the tops begin to yellow — wet soil at that stage causes bulbs to rot in storage. In Zone 10's dry winters, a monthly check is usually enough, but raised beds in sun can dry out faster than you expect.
Companion planting
Good companions for shallots are marigolds, basil, onions and lettuce. Shallots share garlic's reputation as a companion plant: their scent is said to deter aphids and other pests, so they are often planted around vegetables and roses. Lettuce fits between rows and uses the space while shallots are small. Avoid planting shallots near peas and beans, which grow poorly alongside alliums.
Pests and problems
The pests to watch for are aphids, slugs and cutworms. Aphids cluster on young leaves and can be washed off with water. Slugs nibble shoots on damp nights. Onion fly can be a problem in some areas: covering the bed with insect netting from planting keeps flies from laying eggs at the base of plants. The real threat is disease from wet soil and poor rotation, so drainage and a fresh bed matter more than insect control.
Harvesting and storing shallots
Harvest shallots in late spring, 90–120 days after planting, when the tops yellow and fall over. Lift the clusters gently with a fork on a dry day, separate the bulbs, and cure them in a warm, dry, airy, shaded place for two to three weeks until the skins are papery. Then trim roots and tops and store in a cool, dry, dark place in a mesh bag. Well-cured shallots keep for six months or more.
Frequently asked questions
When do I plant shallots in Zone 10?
From October to December, as sets. They are ready in late spring — check your local extension service for the best dates in your area.
How many shallots grow from one set?
Each set divides into a cluster, usually five or more bulbs, so a small planting goes a long way.
Can I plant shallots from the supermarket?
It is not recommended. Supermarket shallots may be treated to prevent sprouting and can carry disease. Sets from a garden supplier are inexpensive and reliable.
How long do shallots take to grow in Zone 10?
Sets sprout in 7–14 days and bulbs mature in 90–120 days.
For the full year, browse the planting calendar hub. Nearby: october in Zone 10, Shallots in Zone 9 and Garlic in Zone 10. Use the seed spacing calculator and the harvest date calculator to plan your own dates.